If you vent to her, don’t forget to ask her how she is doing. Sometimes she needs someone to sit and listen to her.
She is the backbone of her family, but when her friends and other family members expect too much from her, she can start to break. Don’t ask from her what you wouldn’t be willing to do for her if the situation was reversed.
A single mom’s life is hard enough. She should never be in a worse situation after she is done helping a friend out. What kind of friend does that make you?
She can’t do it all, and you should be willing to help her as much as she is willing to help you.