Your friend had a kid when she was too young and is still trying to experience her youth. My mother did the same (although she did abandon me for a bit before coming back). The buying is something she can control and brings her a small amount of happiness. What you can try to do is really have a heart to heart with her. Speak to her calmly, explain how you feel and how you see her actions as doing more harm than good and how it’s preventing her from getting ahead. If she’s receptive to it then that should be enough of a wake up call. If not, well it’s up to you on whether you can stick around. Good luck though