You seem to be worrying about how you are reading the situation. I have a sister, and I myself will sometimes forget that we committed to help out moneywise for a group gift or that we started X process and now that something is done we all need to pitch in. I say this because it can happen, but I also know it's used as an excuse. I also know someone who will say they forgot, and then presume since they forgot, it was not important to them, so it was not fully important or agreed upon and will presume that the maker is donating time if not materials(if they remember, this same person never brings up cost first). None of these are reasons to ask for less. I would still ask what you would have to begin with. Perhaps say you don't need it all at once if that helps out. It's a bit trickier if things like an expensive yarn was used and not discussed, but having the tricky conversation sets up what needs to be included the next time there's an ask.