Helping family coop with a loss and depression

My mom lost her husband and a close familily member close together less than one year ago and although I think her struggles are probably normal I wasn't sure at what point I should be concerned. She went to grief counseling, both group and individual, and does not want to do that again. She doesn't want any meds. I have tried to support her and encourage her to go out with friends or join something, but she's not up for it. She will do things with me and her grandkids on occassion. She seams to be pushing people away. She recently told me she doesn't want to depend on me so much. She had read a book that said " fake it until you make it" and she's been good at that. Others probably don't even know she's struggling as much as she is. I know the grieving process is a "process" but it I feel so helpless. I am not sure what to do or what to look for to worry. Even if I saw symptoms to be worried about, I don't know what the next step is. Any suggestions would be great.