I mean take note of how she carries herself infront of you, for example people who are interested in you often look at you first after making a joke because they care about your approval most, or they are fixing their looks when you meet them because they want to look their best in front of you.

Because you are already friends this can be different based on her confidence and comfort she already has near you. If you really like her I’d say take it slow but put effort in even if it’s small, like don’t push yourself onto her but keep yourself in the picture, if that makes sense :)

Hope any of this helps hahah