<human>: Give me the gist of the text in a nutshell

Okay so a few months ago I rescued a female cat from outside my house, we named her Milkshake, and when we took her to the humane society they said she was 6-7 months old (currently). She is a sweetheart but is more aggressive than nice most of the time. She hates getting picked up and she gets extremely hyper most of the time (fluffed tail, crab walking, dashing in and out of rooms).

I was hoping her mood would change when she gets spayed after I get her vaccinated (she's currently on medication to get rid of some parasites). Will she always stay aggressive? It breaks my heart because my sisters want a nice pet but she's just so mean to everyone when it's not me interacting with her. Will she grow out of it? This is my first time owning a cat.

A week ago a friend of mine rescued a cat, named him Ronan, but was unable to keep him. We were told he was 2 1/2 months old when we took him to the humane society a week ago. I'm trying to introduce both of them, but not all the way because they both don't have their vaccinations. I had them separated, and they got used to each other by pawing with each other under the door, but when I have them in the same room, Milkshake (older cat) follows the younger cat tentatively around, super super cautiously, while the younger cat does as he pleases. When they are closer together with nowhere to run, Milkshake starts hissing and when I try to pick her up she freaks out and starts clawing.

Is there a better way to introduce them? Is my older cats personality just too mean for her to have a second cat in the house?
<bot>: = Have an older cat super aggressive, not spayed yet, will she get better? Have a younger cat trying to introduce into house, but older cat is not playing nice, what do?