J.F.
All kids are different. Is she even ready? There are some checklists online to use to help you know. Is she waking up from a nap dry? Is she interested in trying the potty? Etc.
We struggled with this. Our daughter wasn't ready until a couple of months after she turned 3. I made a chart that had a picture of a Dora backpack on it. She had to go potty 12 times to earn the backpack.
What finally worked for us was this: (not saying it will work for your kiddo).
I gave myself 2 days where we would stay home (dead of winter). She didn't wear anything on her bottom and I put her on the couch to watch tv (on a towel). I set the timer for 7-10 minutes. Took her in and had her sit. She got 1 M&M for sitting and 2 for peeing (and a flower on her chart). By the time we waited on the potty and washed hands and reset the timer, it was really a 15 - 20 minute stretch. When we finally got pee in the potty it was HUGE! Just about the time she was wearing thin of the whole thing, (end of day one and beginning of day 2), she earned her backpack. We made a special trip (in a pull-up) to the store and got the backpack. She was super excited and we used it to put extra clothes, underwear, wipes, and a travel potty seat in it. She felt like she was in control of this now.
We kept up with the M&M's until the bag was gone and she seemed to get it. She is 3 1/2 now and can mostly do it on her own now. Pooping on the potty actually came later, so that was a lot of fun dealing with that! Ugh.
I really hope her sister trains easier than she did. I also think my oldest has gross motor issues and it is related to delayed potty training. She still wets a little in her underwear before she realizes she needs to go. Again, every kid is different. Just start with a well thought out process and stick with it. If she doesn't seem ready and is getting frustrated, stop for awhile and try it again this winter. :)