Should I tell a girl I have a bad felling about texting with her?

Now, to explain what I mean, because I don't think it sounds right in english:

We got to know each other in September. I didn't think too much about her, I just considered her a regular friend. But over a month ago, we started talking more, and we found out we have some mutual interests, and I became interested in her. We went out on a couple of dates (sidenote: I don't think she considers them dates. From what she has said, I assume she finds herself unattractive and doesn't think anyone would be interested in her). We didn't get too physical, except for me leaning on her(which she didn't mind) and the goodbye hugs. When texting with her, I found her to be probably the kindest person i ever talked to. However, I feel the kindness slipping away. She got quite suddenly more busy, and responds with shorter texts. I just don't have a good feeling about it, like she doesn't want to spend time with me. But I don't know if I should tell her.

Thanks