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Sorry in advance for the long explanation.

My sister and I have never had a normal relationship, she pretty much raised me until I was 12, and she's always resented me for that. While she was in college she met a boy and got knocked up (that was two years ago). Soon after the baby was born he bailed and now she's lucky if he pays his child support. I help her out whenever I can (now that I'm in college its less) because she works nights as a CNA. So to help her out, I watched her kid all summer 4-5 days a week from whenever she woke up, usually 7am, until 5pm, I took her to the zoo, the park, etc. and all I asked for was gas money and money for where ever we were going that day (which I thought was pretty reasonable considering it was less than half of what she would've paid for daycare). I ended up paying out of my own pocket for most of the summer. It's now been almost a month and she still owes me $70 (I live off student loans, so money is tight, and that's a week and half worth of gas to get to school and back that I don't have to worry about). I know it doesn't sound like a lot, but she also has been taking money, makeup, perfume, clothes, and even jewelry (Tiffany jewelery my mother gave me for graduation, she worked there and got it cheap but to replace it it would cost a few hundred dollars). In total she's cost me a lot of money, all of which I'm not holding her to, I took some of my stuff back while she was out partying (and I was watching her kid again) the other night and it's all damaged (perfume and makeup gone, clothes stretched and stained beyond saving, and of course no cash).

So back to my question...am I wrong to be completely pissed at her? Is this normal sibling drama?