I obviously don't know your mom the way you do, but to me it seems like she cares. She just doesn't/didn't know what to do or how to react. She probably confided in that friend and asked them what she should do. How she could help you. The fact that she continued to sit by you after you said that says a lot. So often we are told "quit being so dramatic." or "suck it up. We all have problems." Have you talked with her anymore since about your problems?