Even if your daughter isn't on your insurance plan anymore, you can help advise her and offer assistance if she's undergoing any medical procedures.
Make sure that any medical or health issues are taken care of (and paid off!) before your daughter's big day. Go ahead and schedule surgeries, dental work (including braces, fillings or cosmetic procedures) and any other checkups while she's under her current medical insurance. Some things can be considered pre-existing conditions when she switches to her new insurance with her husband, and they might have to be paid out-of-pocket. You don't want your daughter going into her marriage with medical debt or issues that could be emotionally and financially taxing on her relationship.