Can I ask my mother-in-law not to honk?

by Carol
(Dallas)

My mother-in-law moved to the Dallas area almost a year ago. A couple of months ago, she began walking her dog in the park by our house nearly every evening. When she drives over, she parks in our driveway (which is fine) and honks. I don't think she expects us to come out, but it makes me feel funny not to do so if we're home. Second, the honking is disruptive if I'm in the middle of helping our daughter with homework or her piano lesson--of course, she is going to want to stop what she is doing. Is it OK for me to ask her not to honk anymore? I would never dream of honking each night at her house.