What does she mean by “sounds good... I’ll let you know :)”?

My female gym buddy has been skipping gym for a while so I checked on her and turns out she got a muscle sprain. So I told her this

“Let me know if you ever wanna go down for coffee.. can’t promise I’ll be more entertaining than your movies but I’ll try to make you feel better”

She goes like

“Sounds good... I’ll let you know :)”
What does she mean by “sounds good... I’ll let you know :)”?
Post Opinion