Hi V.,
From what I have read, kids aren't fully ready to potty train until closer to 3+ yrs. We started our oldest daughter just after she turned 3,also with the help from her daycare throughout the day. It took her about 2-3 months to master night time, but still with our help.
We made sure not to give her too much to drink after 7 (she goes to bed at 8). Also, and probably most important, my husband and I would take turns waking her once a night (like 11pm) and having her go. She'd complain, and was half asleep, but she would go every time, and have her little bladder empty until morning time.
She's had maybe 3 accidents since then, and will turn 5 at the end of this month. I also found out that the reason she wet her bed (the last time she did it) is because she didn't know that she could get out of bed during night time, or before wake-up time, without persmission from mommy or daddy. Once I told her that she could go potty any time she needs to, without asking permission, then she has been ok.
P.S. Do keep her in pullups at night, until you have at least 5-7 days in a row without anything in them, come morning. Don't forget to praise her in the morning for a job well done. :o)
Good Luck!
Mari