Problems with my potty trained 2 year 8 month old?

Ok, ladies. I'm at a loss. Sophie was showing signs of PT readiness at 15 months old. Seriously. She would tell me when she peed, would take her diaper off. She'd tell me she pooped. She'd sit on the potty all day long. I didn't push it though, I just went with the flow. If she wanted to sit on the potty, I'd let. If she wante...d to wear big girl underwear, I'd let her. At about 2 years 3 months she just seemed to get it. She'd go pee on the potty by herself. Of course, it took a bit longer on pooping on the potty, but she got the hang of that in no time. She's now 2 years 7 months. But, she's still having "accidents". Mostly when Tim is here. She'll pee all day long in her underwear when he's around. I figure it's an attention thing, so I *try* not to get too upset. She NEVER has an accident when we are out and about though-never, not once. But, like today, she said she had to go pee and made it to the bathroom and then peed on the bathroom floor. Later on she was laying on the couch beside me and peed on the couch. I was furious. I sent her to her room to change her underwear so I had time to clean up the mess and get myself calmed down. I go upstairs to check on her and she is laying in her bed. We talk about why she got sent to her room, what she did wrong, where big girls go pee. I feel like I got through to her. I go to hug her and realize she's wet. She had PEED in her bed not 5 minutes AFTER she peed on the couch. Her underwear, sheets, mattress pad, and even the mattress were completely SOAKED. I have to have my BIL come over tonight and clean her stuff now(he owns a professional carpet cleaning service). This happens ALL the time. When I ask her why she's done it, she never has an answer. She always says sorry and puts new underwear on. I'm just at a loss. I don't understand why she's still doing this. We can be out of the house for HOURS, the whole day, and she doesn't have an accident. She goes potty all on her own during this time too. I've even had her tested for UTI's.... What would you do? Do I put her back in diapers? I don't know what else to do. She pees her pants almost every day. I'm getting really really tired of this.See More