What do I say when my mom is crying?

we've recently found out that one of our close family friends went into labor and had an amniotic fluid embolism and she isn't doing very well. her child was saved but they had to take out her uterus and things are getting much worse for her, they don;t think she'll make it much longer. i was with my mom abount an hour ago and i just layed in her lap and she cied softly. i didn't know what to say so i just layed there but i have a feeling that this friend won't make it and then obviuosly my mom will cry again. so what do i say to comfort her? i always cry easily so i KNOW that i will cry if she cries. but i just don't know what to say to her. help? please and thank you!