you don't need to do anything except be with her, make her feel safe and loved and talk to her. Everything else is just gravy.
In fact, if you read up on research into infant brain development, you'll find the best things you can do are: cuddles, talking, doing things together and stuff like that. Not reading or learning or "educational" stuff. They need space to learn their own way, to choose what they interact with and how. She's only just getting mobile, but this will come in time. The more stimulus you give them, the harder it may be for them to learn to amuse themselves. Less form is better when it comes to toys and things.
Sounds like you're doing great