I think my sister's friend likes me. What should I do?

Anonymous
I have always kind of liked my sisters best friend but never acted because they hung out so much she was almost like a sister to me. Now we are all in college and this girl and I go to the same college and my sister moved a few hours away. So now they are not exactly best friends but still very good friends.

Recently I asked this girl for help with spanish and she agreed pretty quickly, letting me know she still likes me in at least a friend kind of way. What got me curious about her again was when my sister came home. This girl came over to hang for a while and I am pretty sure I caught her checking me out. When we were eating dinner my sister was talking to me and I noticed her friend was staring at me the whole time. Then to test this I made sure to not look at her while I was eating then quickly looked up at her and she was looking right at me then quickly turned away. Then later on in the night they were making cupcakes and I went in to the kitchen to feed the dog and when I bent down to fill the bowl I caught her staring at my butt out of the corner of my eye. Then my sister asked her a question and she acted very distracted and needed my sister to repeat the question. The last thing that caught my attention was that night she was telling us how her brother was asking her to move out to colorado with him or to florida if he transfers there (he's in the air force). Then I said something about how I could never live in florida because it is too hot and I like my northern new york weather. She then followed that up by telling me I should move to colorado because she was just there visiting her brother and the weather is very similar. That got me thinking why would she tell me to move to the same place she is thinking about moving too? I t must be that she likes me?

Please help I don't know what to do. It certainly seems like she might like me but its a risk with the long time friendship of my sister and her.
I think my sister's friend likes me. What should I do?
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