Is my friend/crush the jealous type and does she like me?

Ive known her for a month. Well on Tuesday I was hanging out with her and her 2 friends and we went to the park. Ive noticed my friend Stephanie (the one im talking about) staring into my eyes and then she would blush. At times, she would sit very close to me, feeling my hair, holding my hands, or interlock hands. Now when we were joking around, I said ill commit polygamy and have many wives and she got upset very quickly "oh go ahead, do what you want!! Im very mad at you, Andres!" and she just ended up hugging me and crying in my shoulder.

Does she like me a lot? Is she the jealous type? Her friend told me she's the super jealous type and likes me a lot and her birthday is tomorrow soo lucky me I got her a gift and flowers. What do you think?