Advice on 1 year old sleep

Brittany

My now 13 month old is taking a long time to go to bed at night. She has 2 naps a day, both 1-1.5 hours. Her last nap usually lasts until 3:30ish. Her bedtime is always 7pm, but she plays in bed until 8/830, sometimes 9 (ever since she turned 1 year). So this last week or so, we played with one nap (not always at the middle of the day since I know it takes a while to switch her schedule, so it would be like 11-12 or 10:30/11:30) and this would lead to a 6/630 bedtime in which she would wake up after 30 min into bedtime crying for a couple minutes, then play for a minute, then back to sleep. That tells me she is overtired. So...my question is, does it sound like shes ready for one nap, it just will take time for her to adjust and maybe her nap will adjust longer? Or should we stick to 2 naps a little longer?