The sooner you look the sooner you can fix it, so from a welfare point of view you need to do it now. Can you restrain her (or get someone to help restrain her) so that you can just pick up the foot? Or can you tip her quietly and gently?
I have the same problem with three of mine, sponged and mated last Saturday, and by Tuesday they were limping badly

. I've had to tip one to see what it was (and glad I did cos I think it's CODD), so they will all be examined more closely tomorrow and jabbed etc. *groan* who'd have sheep!!
