Do you think that I could ask my mom to stop whistling at my bird?
Do you think whistling at your bird is a bad thing?
When the bird whistles I can't concentrate at my work.
Your parents should respect your wishes with your pet. If she continues the bird might start talking to you and distract you even more.
My pet is much more interesting than she is.
While it isn't nice of you to speak about your mother that way, in this instance she is wrong and shouldn't be whistling at your bird. It's fine if you tell her to stop, because that is creating a bad behavior within your pet.