Potty training

We have been trying so hard to get Lily to sit on the potty.  She absolutely refuses to sit on the thing or the toilet for that matter.  At 2 1/2 yrs old one would think she would be partially potty trained...but no!  We have begun to bribe her with sitting on it.  It worked once a couple days ago and twice yesterday.  Yesterday we spent over an hour in the bathroom sitting on the potty 2 separate occasions.  The first time she didn't go then the 2nd time I forced fluids to see if she would go.  After 2 cups of water and juice I figured she had to go but nothing was happening.  Finally after singing and doing our hair she went.  I think it even scared her.  We high fived and sat there a bit longer to see if she would go more but she didn't.  So we washed our hands and went to get dressed.  But before I could get a diaper back on her she peed on her bedroom floor.  The look on her face was just priceless, in fact I thought she was going to cry.  She helped clean it up and that was that. 

Now today, no interest what so ever.  She won't even consider sitting on the potty.  We have tried stickers, m & m's, juice, tv, you name it but she won't do it.  If she wants to go to preschool this fall she has to be potty trained.  I guess we will just watch her and hope she decides to ready herself!!!