Sleeping getting worse...?

My 8 month old daughter used to sleep really well, most nights she would sleep 12 hours continuously and if she woke through the night she would soothe herself back to sleep. Since she had a uti 2.5 months ago her sleeping has became worse, gradually she would only sleep 10 hours at a time than 9,then 8 etc.. Her uti has cleared up and there's no damage to her kidneys but her sleeping now is so erratic. For the past 2 weeks she has been wakening up to 5 times per night. I've tried changing her nappy, seeing if she is too hot or cold, her gums aren't bothering her, she isnt hungry...i try offering her milk and she will drink a little but not much. Sometimes when she wakes she whinges a bit and i just reure her im there but dont pick her up and she will drop off back to sleep, other times she just cries and cries and wont settle until i pick her up. Is she just playing me up until i pick her up or is it normal for babies to go through a phase like this?