So I have this... 'friend'

When I'm straight shooting with the way I speak to her she's okay but if I start joking around she runs away 🏃🏻‍♀️
So I've been trying not to joke around when speaking with her, but I feel like I'm holding back a part of myself - should I continue to hold that part of myself back to tend to her needs or shall I just be 100% me and if she doesn't like it she can go? Or do you suggest something else entirely?