Move 3 mo. old bedtime

Claire had been going to bed between 8 and 9 p.m.  Then one night I got the bright idea to try to move her bedtime to 7 p.m.  It was a disaster and some how ended up causing her to now go to bed even later.  I think because she didn't go to bed until 10 or 11 p.m., she was sleeping later in the morning.  Because I work at home, I wasn't waking her up at any particular time, just letting her sleep.  Since then, she's been going to bed more around 10-10:30.  Yesterday, I decided to try to shift her a little so when she woke up at 6:30 a.m. to nurse, I kept her up for a little over an hour.  But then she slept 4 hours!  I'm guessing that was still a continuation of her night time sleep.  Low and behold, last night she wouldn't go to bed until midnight!!  I have got to change this.

What's the best way to move their bedtime?  This morning, I got her up at 7:30 (planned on 7 but couldn't get my butt out of bed .  She was not happy.  She feel asleep at 8:30 for a "nap" although I'm guessing if I let her sleep, she could go for 4 hours again.  If you've moved your LO's sleep schedule, did you let them nap for only a certain amount of time?  Do you think if I wake her after 2 hours it might help?  I'm not a fan of waking a sleeping baby but going to bed at midnight is a bit much, especially now that I'm back working.