Mom wants degree but no HS diploma

So I didn’t know where to write this so I felt like it would fit in this category, so my mom wants to improve her English skills at the local community college and then try to get naturalized to get a degree and not have to deal with renewing her green card (my dad got naturalized before they got married). But anyways, she waited till now because she was always so busy with me and my siblings so now that my youngest sibling will be starting kindergarten this upcoming school year and that I’m going off to college next year, she feels like now is finally her opportunity to get the education she wants. However, before coming to the United States, she only completed grade school, meaning that she does not have a high school diploma or any equivalent to it. She doesn’t know if she’s too old to get into a GED program or who to contact about this so I decided to come here for some advice. Please help!!!