A.V.
If she wets the bed at night and naps, then you either have to put on a pull up or diaper or some other cover, or go with panties and a mattress cover to spare the bed. I'm still putting diapers on DD because though she does pretty well the rest of the day, she just can't get up in time to pee at night yet. One step at a time.
A friend used temp tattoos. If his son was dry all night, then he got a tattoo of some cartoon character to wear that day. If they had a REALLY bad day, Dad got rubbing alcohol and it came off. You could do a similar reward. On days when I saw the kid covered in tattoos, I knew it had been a good day and noticed them to reinforce that he was doing a good job on the potty.
I don't know if it would help you, but things we do:
We tell her to use the potty after she wakes up, before bed, before bath, before/after meals. I will sit and read a book or she can take a book with her. If she fights me, I remind her that she's wearing x panties today and we do not pee on (ponies, elephants, bears, whatever).
I try not to be too angry, as she's still learning. I did get upset when, after she'd done well for a week, she pooped, tried to hide it/clean up by herself and got it everywhere. That was not my finest moment. And when she runs around without her pants or underwear after using the potty, sometimes that is very frustrating, too.
I tell her accidents happen, we need to clean up, let's try again. When we had a day where she peed through EVERY pair of clean panties I had for her, I put her in a diaper. She protested and I said that there were no clean panties because she'd had so many accidents. That seemed to get her attention because after that she said, "I won't pee in my panties. I don't want diapers any more!"
So, basically, hang in there. It's a process but she'll get there. I thought I'd never see DD use the potty like this but DH just told me she used the big toilet downstairs all on her own. It'll get better.