Thankyou all so much for the great input .
So I've been working on all the tips everyone has given, I have purchased a kong toy and she loves it. Also I have bought a baby fence to put in my room so she doesn't feel as anxious as she generally gets. When leaving her alone, i have a TV in my room and turn it on for her, this calms her down a little bit as well. The initial crying hasn't stopped, but it's now decreased to occasional whimpering. I have ordered a play pen for her to be outside as well.
I'm a law student and have a exam this Friday, so I hope when she's left alone for 3 hours she will be okay :)
Really appreciate all the advice!