It’s ok a kid in my class she still pees on herself it’s not your fault it’s their end such as wanting to play etc
Just keep putting her on. Eventually she will get it! Training underwear is great! It’s a little thicker than normal underwear is and is a little more absorbent. We started with putting that on and putting a pull-up over top, that way if she peed she still felt it but it didn’t get everywhere
For us our daughter she will pee through anything she has on but if she’s at home with us all day and we can keep her naked on bottom then she self initiates and goes to the potty on her own. Since she’s in daycare and we aren’t allowed to do that it’s taking a long time for her to self initiate while clothed so it takes a lot of patience.
Please don’t be so hard on yourself mama all kids are different. Mine daughter was extra stubborn too. I know you said she has treats are they the same thing everytime? For our daughter we made a prize bag where she can pick what she gets. It has all kinds of little things she loves snacks and little toys cars the thick little glow sticks etc (everything from the dollar tree so it won’t break the bank) that helped out tremendously she felt like she had a little power being able to chose what she got. It was honestly a game changer. It’s frustrating so I know that defeating feeling hang in there.
Definitely suggest the Oh Crap potty training method. I used it for both my son and daughter at 21 months and worked like a charm. My son only took one full day to get it and my daughter took three, but then it just clicked. It’s a day (or maybe two or three if there are lots of accidents) of no clothes around the house, then they can wear clothes but no underwear for about a week. The book tells you that underwear feels too constrictive and can remind them of a diaper, so to avoid that until it really clicks for them. Good luck!!
You’re doing all you need to do it’s just on her end encourage her make her seem like it’s good that you’re going potty on the toilet when she starts again on toilet say good job going on potty and tell her it’s ok to go on the potty not in our clothes or underwear