Baby sleep - Going to bed early

DD was grumpy this arvo so I decided to lay down with her and both have a nap at about 3pm, next thing I know it's 5.30pm and she's still asleep. Now she usually only has 2 naps during the day about 1.5hrs in the morning and 30mins-1hour in the arvo and then goes to bed between 6.30 and 7.30, but she woke up and had a feed then went back to sleep.

Do you think she'll sleep through to normal wake up time tomorrow (6-6.30) or wake up at some ungodly hour? She has the whole teething thing happening at the moment but doesn't appear to be sick and her temp is fine.

Annabelle is in bed for the night at 6-6:30pm so its really not that early. If she needs the rest, let her sleep ;) I would let her sleep, Id be scared that once I woke her it would be to hard to resettle her.