Don't force her or corner her ever...let her come to you and maybe she'll start trusting you again, or at least not hissing and running away. Offer her treats or smelly yummy wet food, but never come after her if she doesn't want it. Just sit and wait -- if you're serious about getting her to trust you again, you'll need to be VERY patient. And if she shows any signs of aggression or stress, leave her alone. You might need to just try this for a little each day, because she should never feel cornered. She'll never trust you if she doesn't have options.