Suggestions for aggressive dog?

I just started watching a small/medium dog who seems to be very fear aggressive. When I met her, the owner told me that she was only like that when she was around because she is protective of her. However it is day one, and I came over this morning to let her out of her crate, and she will not stop snarling/barking at me...every time I try to unlatch her kennel she lunges at the latch and snarls like she is trying to bite me.

I’ve tried treats, bacon, sitting next to her on the ground silently and not making eye contact...nothing seems to be helping...

I’ve contacted the owner and she said she maybe just needs to sit in the kennel longer to get used to me...and she’s concerned she may bite me...

I’m worried because she has been kenneled for some time now and she doesn’t have access to food or water.. so she obviously can’t stay in the kennel for too long!

Help!!!! What should I do?! Any suggestions???