My daughter is 26 months, and we've been working on the potty trainig for about 5 or 6 months now. I started with just putting the potty in the bathroom, and use was spotty, then I was talking to another mom and she mentioned the running bottomless trick, so I started doing that, and it worked pretty well for a while, then she just started peeing on the floor like your little girl. It really wasn't a big deal to me because we don't have any carpet in the house that can't fit into the washing machine, so I would just get a towel and wipe it up, but then I read a bit of advice about how to handle accidents that helped her get past the peeing on the floor problems. When she has an accident, have her help clean it up, and make sure she knows that your not angry, and that these things happen once in a while. That made a huge difference with Makaya.
Then she got into the Little Mermaid, and wanted a mermaid tail. I told her that if she wanted a tail, she had to go in the potty every time, and she couldn't go in her pants any more. She has had even fewer accidents since I've told her that.
Another thing that really helped was I stocked up on panties. I got several patterns, and a few different characters, so she hads a lot to choose from. This makes her feel more in control because she chooses her panties every day (I keep them in a drawer that she can reach, and she opens it up and picks the ones she wants to wear), and because there are so many pairs, I don't have to do a ton of laundry if she has a bad day and has a few accidents. I would only put her in a diaper(We use pampers pull up pants so she can get them on and off herself) at night, or if we were going on a long car trip, so she wouldn't get confused. Also, I would tell her when she was getting dressed that since she was wearing big girl panties, she had to tell Mama when she needed to go potty so I could help her because her pants wouldn't hold her pee, and she would be very wet if she didn't.
The only down side to this is that she often times goes into the bathroom to go potty and then doesn't want to put any pants back on at all. But she has always liked to run naked instead of being dressed. It's just a little harder to keep clothes on her now that she knows how to get naked on her own.
Hope this can help some. :)