What does it mean when she always says I appreciate what you're doing?

euaiyaya
Whenever i do something for her, I don't ask anything in return and just say it's all good. She always says i appreciate you but doesn't really show it with her actions. She shares a lot of personal information but doesn't add me on social media or anything. I met her in a game and she keeps bragging about guys that give her some things.

I like her, but her likeness with me is like a rollercoaster. Some days she's so sweet, some days she doesn't reply a whole day. She does initiate but after a few exchanges, she's gone. Is she just using me?
What does it mean when she always says I appreciate what you're doing?
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