My best friend is a bad parent.?

So I love my best friend but I think I'm starting to hate her because of the way she treats her daughter. She and I are 25 and her daughter is 5. My best friend left the father and then he ped away so she is a single mom. She is a smart, strong, and independent woman but having a kid is defiantly not for her. She always tells her daughter to "go away" "get off me" "stop being a tar baby." and when she gets hurt or upset and me or someone else tries to give her daughter attention my friend will say, "she's only crying because she wants to be coddled and babied." Seriously, sometimes I want to shake the **** out of my friend and be like, "SHES ******* 5!! of course she wants attention and to be coddled and babied!" But I swear my friend is such a ***** to her. And I know if I say anything she will get offended. My friend treats her daughter like she is an annoying little pest. Like she is a burden. I hate to see her daughter be treated like that and honestly I think it's causing me to resent my friend. It's like whenever she calls or texts me I just don't feel like talking to her. Even if I were subtle trying to talk to her about it I know she would get a defensive attitude. First she acts like she doesn't understand what I'm saying and wont take me seriously, then she would make snarky comments. As if I dont know what I'm talking about or I'm the one with the problem. She is such a difficult person to talk to. It's like you need a group to confront her but if you do that then she will feel attacked. I just dont know how to tell her how I feel without her getting all pissy/bitchy. Her attitude towards her daughter offends me, erks me, puts me off, makes me mad, makes me frustrated, irritates me. My friend is such a difficult person to talk to. And she is kind of one of those dish it out but cant take it kind of people. Anywho, any advice would be much appreciated. Thank you.