Her number should already be in the rafters.
Honestly, I really don't get the obsession with this. There's been a rush to memorialize things by calling for Iowa to retire her number before her season (and career) was even over. She had an utterly incomparable career at Iowa and I think it is very, very, very likely that the athletic department will do things to celebrate and honor that (likely including the retirement of her number), but I don't get the need to rush to the finish. The idea that you would retire her number while she's continuing to play in it is just incredibly strange and has no precedent that I can recall.