Should I be mad that my friend got this drunk at my party?
The problem here isn't the fact your friend got drunk at your house party, it's the fact that you seem to underestimate those you invite to not be impulsive when it comes to drinking. It doesn't make sense to throw a house party, (of all things) provide alcoholic beverages, and hope that everyone will drink responsibly... the fact that your friend is 30, and goes to university, is beside the point because you can make the same argument for anyone who attends university at any age (legally). Your argument would be valid, and understandable if your friend was underage, and drinking at your party, but since your friend is her own person and is old enough to make her own decisions, then it's not up to you to judge her on that, because if it was you, and you were at a house party, would you be expected to hold back, or would you want to let loose too and have some fun? So this may be a lesson for the future, if you're going to throw a party and provide certain beverages, then you cannot expect everybody who you invite to control how much they drink, regardless of who they are or what they do. There are some situations that you can't bend to your will, especially when other people are involved, you can't be in control of everyone. Let this situation go, and try not to hold this against her. Does this mean she'll get drunk again? Possibly not or maybe she will.. but what she decides to do is up to her, vice versa to you and your life. Try not to dictate what your friends should or shouldn't do if you don't want to be treated that way yourself, then simply don't treat others in that way. A little bit of constructive criticism won't harm you, so please don't think that I am hating or coming after you, because that's not my intention. Hopefully, my advice has helped you to somewhat rationalise your position in this situation.
No doubt she learned her lesson.
I can see why you were disappointed in her to not be more responsible with how much she took. Many people always assume they can handle it or are strong enough. But if the alcohol was provided, then in a way, it shouldn't shock you if somebody is lying all over the floor wasted.
You said she's 30 twice, like turning 30 should turn you into a monk or something. You didn't actually say anything that would've reflected poorly on you or that she did that really put you out in any way, so to me, it sounds like you're being pretty damn judgy, so damn judgy I can't help but wonder if you're still in high school.
Nah, there's always someone who drinks far too much at a house party. As long as they didn't hurt themselves or anyone else or smash the place up stumbling about don't worry about it.
She may not have set out to get wasted; could someone have inadvertently or deliberately added something to what she was drinking?