I came home from work today and found my dog to have several red "bite" looking marks all over her body but more around her head and throat. She was also extremely swollen. I gave her half a benadryl on a cookie (snausage). My girls told me she had went out on my back porch and came back inside like that, so I just thought she got stung by a bunch of bees. The vet told me to keep an eye on her and within a few hours if the swollen-ness went away then the medicine worked and she would be fine. This all happened around 6-7 pm. Everything cleared up so me, her, and my fiancé went to bed. Its 2 am and my fiancé woke me up because she is more swollen then she was earlier today, she's still seems to be acting like herself but she is itching and rubbing her face on the floor and our bed. We gave her another bendadrly, and gave her a bath, what else can I do (obviously beside from rushing her to the vet in the am-sorry for spelling errors, very stressed and scared)

Assuming that you gave her the correct dose of benadryl for her weight.
If she was swollen again at 2 am, then I would make another call to the vet, she may need steroids in pill form or by injection to deal with the inflammation,one of the dangers with allergic reactions is the risk of the respiratory tract also becoming inflamed making it difficult for her to breathe.
I would touch base with the vet again, and have her checked just to be certain of what actually happened to her.