a) regardless of what "people" say, she's not ready
b) she can definitely sense any stress, urgency, etc. from you & dad, which could be a factor as to why she's fearful, nervous, stubborn about the whole thing (if she even "gets it" yet)
c) there is no "perfect" age as to when every single child can / should be potty trained, so try not to let what others say & do with their kids cause you to think you're doing something wrong or negative with her
d) EASE UP - seriously. Back off all potty "training" together. Leave the potty out & have fun with it.
During the summer, put it out in the backyard & let be naked. Let her explore it, investigate it - on her own time & without anyone coercing her into doing it. Get several potty-themed books from the library & just leave them in her assortment of books - if she wants to learn about it, she'll let you know. When she starts to take notice of the potty, be there to answer questions or get excited about it with her.
Trust me, every mother KNOWS how frustrating this is & every mother has their own story to tell. Decide NOW what you want your story to look like when she does finally succeed with it (which she WILL) - do you want it to look like a year or more of tears, frustration, anger, bribery, etc. or a year of watching cues from your kid & letting her take the lead? Obviously you'd love for her to be fully functional when baby #2 comes, but there is regression to consider, most especially if she's been rushed into it from the beginning. And she may be sitting on the potty & going when you want her to at that point, but really that's only part of the whole process. There's a lot more phases to get through beyond just that.
You'll get to a point when you trust that she understands the concept & is maybe just being lazy about it, but it certainly doesn't sound like she's had a chance to get there yet. It might take a year, or only a few months - no one can promise you a miracle "method" that doesn't include a lot of practice - and that's what every kid needs - PRACTICE. I know, she's not even sitting on the potty so how can she practice...but she'll get there.
Before bathtimes once or twice a week ask her if she wants to sit on her potty so she can "tinkle" before she gets into the water. If she's watching you go potty ask her if she wants to be like mommy on her potty. Easy, no-pressure things like that indicate to the child that she has the control over her body, NOT YOU. Don't just plop her on the potty & demand something from her - give her respect, ask her if she wants to sit, & if she doesn't, move on.
As for pull-ups, the only time we used them were during travel of longer than 2 hours. We never called them pull-ups or diapers - we called them "travel underpants." After a handful of times using them on roadtrips, we chucked them altogether because he was able to hold it. But I started "training" my kid at 2.5 to get him into preschool at 3. He made it (by 2 weeks) but it was very stressful & he's now 3.5 & we're still not 100% there yet. I plan to have a much more laid-back approach with my 2nd son, including "introducing" the potty at a much younger age, just so he is familiar with it rather than rushed into it.
Take a deep breath, try not to freak out about the whole thing & enjoy your daughter for who she is & where she's at right now. When it's all said & done, you'll be thankful you did & you'll realize how unecessary & unhelpful stressing over this type of thing is.
Good luck!