bridee - It may just take a couple of weeks for things to get back to normal. DS was quite ill for about 4 weeks with bronchiolitis (so he started waking up very frequently during the night). After he got better, it still took 2-3 weeks to get back to normal sleep patterns. But, this week he's been great. Our sleep routine is very similar to yours (7:30 - 5am-ish, then back to sleep until 7:30am-ish). I tossed up whether to get rid of the dummy, but decided to wait & see how things went - and he did manage to get himself back into routine with the dummy. So we've just kept using it.

If you do decide to get rid of the dummy, I would start with day sleeps & see how she goes?