Is she rude? Would you be alittle upset?

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My boyfriend cousin came from out of my country (South America) she told us that st the airport, she lost her wallet. So she had nothing on her besides her passport. This cousin is close to my boyfriend because they grew up together & my boyfriend has good judgment. So I told my boyfriend that I will take out him and his cousin. This is her first time in the city. We went by the beach and we went to a 3-4 star restaurant (food was nasty but a little pricey) I town her she can other whatever she wanted on the Menu as her ENTREE only. & she can order an alcoholic drink too & that I was paying. This is the first time meeting her, BTW. I then excused myself and I went to the bathroom. When I came back, I saw that we had an Appetizer. My bf said she ordered it. Alittle confused but I didn’t mention anything. Anyways, the bill came and I took it and saw it was $18.99 for the appetizer. Now, money isn’t an option so don’t get me wrong, I don’t care that she ordered it because of the price. what I found weird about it was that I specifically told them what they can order before I left to the bathroom but she decided to add In an extra order while I was gone. Of course, I paid for the whole bill. I think it’s the principle of it besides the actual cost. What do you think? Am I being unreasonable & over thinking???