Oh, god, rickman, you poor thing - have you any idea how he will look before you see him? Are you taking your kids with you? As it's only his second lot of chemo, with a bit of luck he won't look too different from before. Hard to keep a happy smiley face though...
See how much she talks first. If it gets sticky, then you can just chat about general stuff - she may well prefer not to talk hospitals...
Good luck - hope it is a nice positive visit.