Hi Jinxygal. I know it can be stressful trying to manage your own mental health and try to assist someone else. I find that you need to find a balance between looking after yourself and helping others. When you go on an airplane you are told
fit your own mask before fitting others
There is a reason why we have to do that. You can not help others if you do not help yourself. Maybe you should let your friend know that together you both need to be open about mental health and try be a support system for each other. Or maybe let her know if you are having an off day and need avoid certain triggering topics.
When supporting someone a lot of the time they just want someone to talk to and listen to them and be understanding. You just listening is helping them more than you know.