To me, this is yet another stage where we kind of lament the passing of time even as we are pleased and excited with the next stage: sleeping through the night (which some people have trouble with, believe it or not), giving up breastfeeding, first steps (because you never know where your kid is from that day forward!), leaving them at preschool, watching them get on the school bus for kindergarten, first period, first bra, first date, learner's permit, first solo drive, and so on.
You are very lucky in that she is still cooperative and still kind of interested in you (!) and she is, at least, in her room and not roaming around without telling you where she is. I went through a stage of thinking I was no longer relevant to my son, and my husband was great about reassuring me. I think some of it is changing hormones, but the rest of it is her trying to learn to be without you. Does that make sense? She knows, on some level, that she's going to have to survive on her own, whether it's at college or in her first job/apartment. Proving she can manage without you is a way to build confidence in herself, rather than a rejection of you in any way.
What helped me - and I hope it will help you in advance - is when my son went away to college. He had gone through a phase of being a bit of a smart aleck, know-it-all kind. Not horrible, not something we could really discipline him for in a major way other than a few comments about "respect or no car keys" but definitely present. Once he went to college, he really saw how much he still needed us. We had prepared him quite well, I think, as much as one can - he had his own bank account and debit card (we monitored online) and did his own laundry for years, for example - but still, it was a big shock. And he had a roommate who didn't even know how trash and recycling were removed from the room (duh - you take it yourself!) and didn't manage a bank account or even use an ATM until senior year because his mother drove 3 hours each way to bring him cash. Yes, really! Great kid, great family, just overprotective mom. He really struggled, with his own schedule and with other students being blown away by his dependence, because she protected him too much.
If you remember how you felt when she started to walk, and you knew you just had to let her fall and get hurt sometimes, you might try getting into that "head" again. You have to let her NOT need you - she needs to do things without you and not make plans for mother-daughter stuff except for special occasions. I know that's hard - but she needs to rely on you in a new way, knowing that you are not her pal and that you will be able to handle any of the grown-up crises that will come her way. You've got to show her that you won't freak out with late-teen drama or issues, the same way you showed her you wouldn't freak out with every bruise or cut when she was little. She's going to need that more than you know and more than she knows right now. But her instinct is preparing her for it.
You sound like you are pretty on top of her with the big stuff, so I imagine you are checking her phone and her computer to be sure that what she's texting and emailing and binge-watching are appropriate, and you know she's not doing drugs or anything. So I would pull back and also give her additional adult responsibilities that she will need when she is out on her own. If she doesn't have a bank account, go with her to the bank to set that up. If she's not doing laundry or if she's not able to prepare some basic meals and clean up after herself, it's time to do that. You can "graduate" into the financial overseer vs. her personal ATM who hands over cash when she needs it. Let her learn to budget, and don't bail her out if there's "too much month left at the end of the money." Of course you will help with a back to school wardrobe or a prom dress, but not the basics. Even if you give her a certain amount of money every month, let her pay her own cell bill and so on. You can try to make it a bonding experience, and if that works, great. If it doesn't, that's okay - you have to be the bigger person here and look down the road 2-3 years.
What I can tell you is that the rewards are great when they go to college and really, really start to appreciate you. There was something oddly comforting about my son coming home on fall break and for Thanksgiving, sleeping away the exhaustion and being really grateful for every cooked meal and every load of wash I did then (because I knew he didn't require or expect it of me).
And they wind up consulting you for bigger stuff, and that's a whole new reward.
If you can take the long view here, it really helps.