If you don't feel you can console in any of your family atm, then you'll have to wait a little bit longer. You can only really tell her once you're feeling strong enough to do so, and once you're strong enough to handle her reaction.
Put it this way, if your mum has always taken care of you, been over protective, gotten on well with you, she's probably going to take it fine.
I hope everything ends up A. okay.