Vent session/HG in early pregnancy

I am 8 weeks pregnant with my second child and just left the hospital where I was diagnosed with Hyperemesis gravidarum (HG). I’ve been having severe morning sickness for days and have been completely miserable. After an overnight hospital stay, lots of fluids and zofran I am resting at home! One of my good friends had her sons first birthday party today. Due to my not being discharged until half way through the party I wasn’t able to attend. I texted her updates since last night & let her know I might not be able to make it. After the party she texted me demanding to see photos of my discharge paperwork and my hospital bracelet because she can’t believe I would miss his birthday. I am beyond frustrated and disgusted with her selfish behavior. Any advice ladies? I feel like I am done with this relationship.