Welcome to the terrible twos. There will be major regressions when kids potty train young. 2 year olds are super distracted, so to expect them to be fully trained is to expect too much. What you can expect is for them to get 90-95% in the toilet consistently.
They will go backwards with major changes, and they will regress if you pressure them. DO NOT PUT HER BACK IN DIAPERS. Pee and poop go in the potty, end of story. Consistency is key here. Unless you want her in pull-ups till she is close to 4, do not undermine her confidence by fully regressing. Babies wear diapers, toddlers use little potties and training pants, and preschoolers use the big potty. There is nothing complicated here; it only becomes a problem if you expect her to be fully trained like you, when she isn't even 2. Accidents will happen. In fact, expect her to pee herself when she is upset even as old as 4. They lose control of their bodies, and that's that.... My point, you can't really expect 100% in a young toddler. You can expect 95%.
In any case, stop with the bribing. Pee and poop go in the potty. Don't making pottying anything different than other normal physical need things. When we are hungry, we eat, when we're tired, we sleep. When we feel pressure here and here, we go to the toilet. Don't show frustration, don't make this a power struggle area. Tell her she is a big girl and that she is responsible for her pee and poop. Then let her have accidents. She doesn't want to have accidents, but she will like to fight with you. 2 year olds take great pleasure in upsettting their mommies. So don't let her. What she really wants is to please you, but negative attention can be exciting. Don't feed the negative attention, and the terrible 2s aren't so terrible.
I know it's hard, but don't let it get to you. She is most likely doing amazing, but you are expecting too much. Don't keep track, just support her: "oops, I'm sorry you peed your pants, next time we will get to the potty on time." Support and love is what helps them get to the 95-99% range --both of my kids got there by 2 years, including night training. With that said, they still had occasional accidents (when upset, when so distracted --my 4 year old pooped herself at her 4th bday party because she didn't want to miss out on a second of fun).
Lots of folks on here are going to tell her she is too young and is not ready. Please do not listen to them. There is a potty window between 15-24 months. If you take it, your kid can be 95-99% trained by 2. The rest of the world trains before 18 months, only in Pampers loving America do we allow our toddlers and preschoolers to sit in their own fifth.
Accidents are only frustrating if you let them frustrate you. If you see them as a natural part of the process, they become no big deal.