I had this same thing happen with a magazine editor who disliked art. At first, I thought she wasn't doing her office job because it was related to art somehow, so I was frustrated waiting for a desensitization kit. She also refused to check the incoming marriage proposal.

When I quit the game and reentered, she was able to read and accept the marriage proposal though. A few hours later I bought the desensitization kit anyway because I planned to get paintings and didn't really want her to have this dislike.

Try exiting the game and trying again.