Sounds as if she in the past was bad and put outside to be got rid of... like she knows bad = outside. Poucner can be VERY bad, hoping that I'll give up and let him on the balcony for a bit. Cats are far from dumb! Keep up working with her. Cats going outside in a rural area is one thing, cats going outside in the suburbs or cities another. If you live in a busy area, please do try to not cave in and put her out. She'll get used to being an indoor-only cat soon.

I still seriously think she NEEDS a playmate. Make a deal with him... see if you could perhaps foster a cat from a local no-kill cat rescue. If she calms down after the inroduction period (there will be a tedious week or so of hissing and unhappy kitties) then you get to keep the foster. If she does not calm down after she and foster kitty make friends, then foster kitty goes once he/she is adopted. That way there is no financial output of your own like you did with Meka. You would only pay for second kitty if Meka approved of him.her.