When I hold and stroke my new guinea pig she makes a very quiet almost squeaky sound when i touch her that sometimes is accompanied by a purr here and there if i pet her in a certain spot. Her eyes seem very mellow and start to close like she is going to sleep or it just very relaxed so I know this isn't a scared sound but is it a happy sound? Is she liking being in my lap and having me pet her? Or does this sound mean something else?