One college break is going to turn into another. Really, the college year goes so fast. Fall break. Thanksgiving. Christmas/Winter break (often a month long!) Spring break - before you know it, the year is gone. Take the first break she is home for the year and set some expectations. “So excited to have you home for Thanksgiving break! Just so you know ahead of time we’ll be going to Aunt Carol’s on Thursday around noon and on Saturday I’d love to take you out for lunch and shopping - how’s that sound?” Make sure you paint a positive picture of spending time together, include the BF when it feels appropriate (not just when you feel like it) and see how this goes. Tweak, rinse and repeat for Christmas.
If this guy truly has what she’s looking for (for this moment in life anyway) she’s probably going to stick with him for the time being. If he’s not, she might start noticing/paying attention to other guys at college. But that will be her call.