That's good news.
There are a few things you can do that might provide some clues as to its appearance and ultimately lead to resolving it. They can be a bit time-consuming and potentially intrusive to your daughter's work, so you'll need to find a time when you can do that. For example the first thing I'd like to see is a screenshot of that message when it appears so that I can confirm it's what I think it is.
In the interest of time that would be otherwise spent on a lot of iterative back-and-forth discussions, I suggest using the following program: Using EtreCheck - Apple Community. It includes instructions for pasting its report in a reply to this Discussion. If you need any help with that please write back.
It's important to determine the legitimacy of that message because certain notorious adware has been known to result in its appearance. This is a screenshot of a recent example:

The point I'm trying to make is that dialog is completely bogus. You can see for yourself the Mac in that example has plenty of available memory.
It's also easily fixed. But I don't yet know whether it's what you're experiencing or not. That's the reason I'm suggesting EtreCheck. It'll make things easier for both of us.