What is a good way to talk to my mother-in-law about this?

The nurse from the retirement community where she lives called to say that they have noticed that she is having short-term memory problems. Obviously, we are concerned that she could leave a pan going on the stove or something.

The nurse said that when they have dropped by to check on her that she has been defensive. She tends to be defensive about things anyway.

Any ideas on how to address this? We have been wondering if having her doctor do some cognitive testing would be a good idea?