S.H.
Its just a nap tweak... and its only been 1 week since she was sick.
Just keep to your usual routine for naps... and times.
But before her nap... let her wind-down first... PRIOR to her actual nap time. Just make everything quiet... calm... dark.... boring.
Verbally cue her.... that nap is 'soon'... which can even be half hour later after you verbally 'cue' her. Then get ready... without 'rushing'... turn things off etc. Tell her YOU are going to nap too. Then go about your routine PRE-nap. As usual.
That's what I do. My son is 4 now, but he still naps everyday, in the afternoon. It is auto-pilot without any battle about it.
And yes, a tired kid, will NOT like being woken up... and YES they get real crabby if woken up. Because, they were sleeping... deeply. I am like that too. No one likes being woken up.
For times my son naps late... in the afternoon, I NEVER wake him from his naps. He naps 2-3 hours. And I LET him have his full nap... even if that means he wakes from his nap at 6:00pm. And he will still go to bed fine, at his usual bedtime. No problem.
all the best,
Susan