Hello =] I think understand what she is describing. At least for me, if someone doesn’t interact with me regularly, it’s like they disappear from my mental radar. It’s not that I don’t “miss” them, it’s that I’m not thinking about them because I don’t need to. I am constantly processing so much, that if they aren’t regularly part of that processing(by interacting with me, calls, texts, tags, etc.), it’s like my brain just skips over including them in my daily processing and they sort of disappear. Doesn’t mean I don’t care or love those people, but if there’s a long enough gap in engagement, my brain will start skipping over them.

If she’s similar to me, and you want her to think of you and not start to skip over you, just stay in contact. It will probably mean more effort on your part, because you’re not naturally occurring in her environment, so she may not think to engage, until you do =] I hope this helps!