What does it mean when someone says “keep in touch”?

Ok. Obviously I know what that means lol. But, I just reconnected with one of my best friends from child hood. We never had a fall out or anything. Life just took us on different paths over the years. Well she recently had a baby & got engaged, so I reached out. I was so happy to hear from her & we met up at her house & had lots of laughs. I really want to mend our friendship but idk how to go about it without seeming desperate. When I left her house she said keep in touch, but I wasn’t sure if she was just saying that or if she really wants me to reach out every now & again. How do I go about mending our friendship without coming on too strong?