The thing is, with acting, you have representation looking for work for you, and hopefully, your own body of work makes you top of mind with casting agents, producers and show runners. A lot of actors take smaller parts because they want to work, they want to try character roles or parts they normally wouldn't be considered for, but they try to keep working. She's had mostly small (very small) roles, with the exception of Dalmations, The Christmas Card and The Vampire Diaries. That's out of some 42 or so roles as noted on IMDB. There was a story a while back in the threads about how she pitched a fit when she was kept waiting at an audition, her agent tried to talk sense into her and either she fired them or vice versa. Given what we've seen of Alice, I am betting she axed them. She doesn't like being told no, and no is something actors in particular have to get used to hearing. Plus the cruel reality is that it's tough for older actresses to get decent roles, older meaning anything over about 35. So she is behind that 8 ball as well.
If she had had a really robust career, even doing smaller parts but doing them well and being respected in the industry, the parts would have continued. It's worth stressing that her last role was in 2018 and she had small roles from the time Ella was born. She truly didn't give up a career in the sense of turning down roles and saying she didn't want to even be considered while her kids were young. She just wasn't and isn't getting the offers and now it seems she doesn't even have representation. Also interesting that she talks about needing to be away overnight. That would be for a bigger role in a more prestigious production than she would probably be considered for. Not being mean, just realistic. There are probably plenty of walk on or one or two line roles she could get right in LA but she would turn up her nose at those.