Its all kinda intertwined so, its hard to tell the story with out getting into full detail
But, basically the highlights of hoe her fits in are
Shes is a colleague of Connors, who he turns to, for help with his experiment, more to the point, knowing that she was going on a expedition to South Africa (or where) he wanted her to get a blood sample from a rare species of lizard fro that area, hes gives her a sample of the formula that hes been working on, to mix the blood with (as it need to be a fresh sample, as the formula has some type of built in stabilizer)
When there she meets Sergei, and hires him as her guide, turning their travels they grown closer, even start to fall for each other, blah, blah (all the love jazz)
At some point, they are attack by a lion, he fights the lion off to save her, but, it nearly kills him, he has massive blood lost, yada, yada, yada
In a desperate attempt to save him, she (remembering that Connors mentioned the blood stabilizing abilities of the formula) gives him some of the formula
It works, and by morning hes feeling better then ever, so, much that he insists that they continue on, she relentlessly agrees, and they finish the trip, ever found the sample for Connors
When it come time to leave, she convinces him to come back with her
Once back in NY she meets back up with Connors and give him his sample (having figured out what he wanted it for, she tries to warn him, but, fails to tell him that he used some of the sample) almost as soon as shes out of the room, without even testing it, or double checking the sample, in his impatiens he takes it
it starts to work, hes arms grows back, but, then he goes into horrible pain, its basically implied that because she used some of the formula its messed with the balance and the lizard DNA because more dominate) as we see his skin start to turn, he screams out, and Mariah still only half way down n the hall, hears him and comes running back, when she get back to the room its to late and hes nearly full it in his transformation, and is just trashing around the room knocking everything down, she comes in and gets knocked out, or something (but, not before catching a glimpse of what happened to him) the lizard gets away (jumps out a window or breaks though the wall or something)
She is found and rushed to the hospitable
Kraven who was waiting out side for her, see her being taking out, and goes to the hospitable with her, as soon as get a chance a to be lone with her, he tries to talk to her, she only awakes for a moment, and start screams about a giant lizard, Kraven vows to find and stop this lizard who hurt her
atleast thats the quick version
Theres also a subplot about the formula (mixing with traces of lion DNA that got into his system, throu, open wombs turing the fight) giving kraven him enhanced abilities, that I was playing around with