Help me understand this phrase

It was my last day in my job today. Absolutely nightmare for me as I have absolutely no idea what I’m supposed to say to people but I muddled through in an awkward fashion.

My service manager has helped me a lot and seems a genuine person. She came to see me before I left and said thank you for your work with us. I’m sorry a job didn’t come up for you while you were finishing with us (that’s a lie they just didn’t want me staying). She then said ‘let me know how you get on. I’ve got your personal email anyway’.

Now this kind of comment confuses me completely. I know this means let me know how you get on job wise but is it just a polite thing that is said or does she actually want me to let her know when I get a job.

I want to ensure I come across well as this is a major employer in my field.