Why did she say "eww" around me?

Friday night, my crush was at my house (only because she was with her Mom to pick up her brother) and we were all gathered in the living room. Eventually, I got up to go get something to show them. As I was walking by my crush, she couldn’t keep her eyes off me. I noticed this out of the corner of my eye. However, when I was almost out of her sight, I heard her say “eww”. I wasn't looking at her in a strange or perverted way and she didn’t make a disgusted face nor did she smile at me to indicate she was only joking. This puzzles me; because I thought she liked me back (she would do the aforementioned looking at me, mimics me, asks people she knows questions about me, blushes around me, etc.), but this isn’t the only time she’s done something like this. One time she made a “eeeehehehehehe” sound and another time, a moan.

I know she's not a mean girl, so she couldn't be doing this to be cruel. Could it mean she’s trying to get my attention or what?

It kinds sounds like there was something on you she was staring at, that was gross. Like maybe you had a booger hanging out of your nose that you didn't notice, so she was staring at that, then when you were out of the room she was like, "EWWWWW!" You gotta keep in mind that there's plenty of things that could be gross about you that you never notice.

Dude I know what it must've been. When u left was her mum & urs there in da room. What culdve happened was as u left they noticed her looking at u leave- then culdve made a gesture to her saying u like him. Naturally a response wuld be to say no or in this case "eww".
* so it culd be she said eww to get da mums off her back but realy does like but was shy.(good chance) OR
* she doesnt like u.

Talk to her that u heard her n catch her out. but be genuine see if u can get the truth out of her ay.