Imagine you care about school (you might actually, but if not, pretend for a second). You care about getting extremely good grades, and then a test comes back that you flunked. You have no idea how it happened, you thought everything was fine and the teacher was good with your work, and then BOOM, out of nowhere, fail.
The last thing you would want is for your mom to freak out on you, and panic, and be upset, and cry, and wonder how on earth you were going to pick up the pieces from this test. You would feel more panic and more upset because she was upset, and you would feel less confident and sure of how you were going to deal with the mess.
This is what you are doing to your mom right now.
Mind you, she's an adult, and she's pretty comfortable handling freak-out situations by now, but my point is that you need to stop worrying about it.
She has a game plan in place, she is upset by what has happened, but she is taking steps to do what she needs to do to survive and to help the family (aka you). She will tell you when she's ready, but until then, your job is trust that she knows how to take care of you. In the mean time, be helpful; do well in school, help out around the house, and make your financial demands on her less often.
Just like you would, she will appreciate support and quiet help, not freak outs.