My son goes through stages like this quite often. If there is any change to routine/setting it usually means we will get a visitor for a few weeks. All I can recommend is what we do, let her come in for a few nights and see if it settles. if not talk to her about it. We have a reward chart for DS for when he wakes up in his own bed and we make a big deal out of it when he wakes up there. I used to carry him back into his room after he had gone back to sleep but he is getting to heavy to do that now so I have his old cot mattress on the floor and I just move him to that but it is best if they can wake up in there own room.

As for the waking early part - try adjusting her bedtime and see if that helps I know if DS goes to sleep any earlier or later than 8pm he is up at dawn, also check and see if it's overly bright in her room or if there are any noises that start att hat time (bird calls, trucks etc) Good luck hope you get a good nights sleep soon.