Advice

So I'm not a mother but I do have a godchild and my godchild's mother is not attached to him at ALL! He barely knows who she is, she doesn't say oh I'm mommy or mommy loves things like that. She has PPD (post partum depression) but she doesn't seem to think so. My family and I bought everything my he owns clothes, stroller, everything. She always wants to go out with me(which is fine that's my best friend) but I always tell her we have to prioritize we can't always go out we have to save money, she's like oh I do love him and I am attached to him. It's weird because when she sees baby girl's she gets so excited and her eyes sparkle she sees her son and it's like oh ok that's my son. She ONLY wants to be mother if like we have to take him to the doctor or something like that but she barely wants to play mother when we take him to the doctor. Her favorite line is but 'oh I'm his mother' and she stares at him he'll be in his playpen and she'll be staring at him and I'm like what are you doing and she's like oh I'm interacting with him I said that's creepy and she's like how is that creepy. My WHOLE family loves him, her family only tolerates her for the baby and her family treat her like sh*t it's horrible. She knows how to give advice but she doesn't know how to take it. Basically her mom convinced her to keep the baby and now here she is struggling.. I just don't know what to do I LOVE LOVE LOVE my godson with Everything I have but I want my best friend to get it together. Have any opinions for me girls?