How will you verify signatures in the future? She isn't going to be signing checks with her maiden name. I'd want to be able to see her whole signature when matching and not rely just on her first name. If you get bought out or the staff changes, they may not recognize that the person at their window is in fact the same person who signed the signature card.
And if, heaven forbid, something should happen to your bank the FDIC (and your customer) may have trouble determining the ownership of the account.
At my FI it's always a new name, new signature policy.