I Don’t Want To Babysit For A Friend

I have 2 kids (5 and 7), and a good friend I’ve known for years just asked me to watch her 2 kids (also 5 and 7, who I’ve known since they were babies) for 2 hours while she’s at a dentist appointment. My first reaction is that I really don’t want to. Her 7yo child is not a great listener and I don’t often invite them to my house for this reason. So I don’t want to babysit them, and if I said yes, then I’d resent it. But then I feel bad and think that maybe I should be growing and choosing better thoughts about her child so that I can help her. I don’t know who else she could ask to help. I feel torn and would appreciate some insight. Thank you, coaches!!