I'm sorry to hear about your parent, and I hope they are doing better. I understand feeling like a bad owner, especially this time of year

Remember that reptiles are really forgiving when it comes to feeding, as they don't have schedules in the wild. They can go a while without food (enough that some people are willing to go on vacation for a week or two without worrying about feeding during that time). Yes, she is probably used to the schedule if she's been on it for a while, but she'll be fine. I've found that writing down feeding days on a calendar has been really helpful. Maybe you could try putting reminders into your phone?