Hello and welcome to BW forums
Wow your LO has given you wonderful nights up to now hey?
More questions than answers from me I'm afraid but perhaps something will ring a bell with you?
Has anything about her day time routine changed at all? New child minder, nursery? Anything?
Do you do double voiding before bed time (2 wees about 30 mins or so apart just before sleep)?
Is she drinking sufficient water in the morning and early afternoon? And is there anything that might have altered her fluid intake recently (ie new nursery etc as above or different meal and snack routine)?
How about putting a little potty in her bedroom so she doesn't have to go walking past others doors making noise to have her wee? Even just having the potty in the room might reassure her enough for her to return to sleeping through without needing to get up to wee.
It sounds to me like the bit of anxiety caused by the few wet nights when she was ill is keeping this thought in her head throughout the night so when she goes into a light sleep or reaches the end of a sleep cycle instead of moving into a another cycle she brings herself fully awake to ensure she stays dry. Have you reassured her that it's ok and totally normal for there to be an occasional wee in the bed, especially when poorly?