I hate seeing her bored and depressed all day, she barely even comes out to fly now, her old cage had a mirror that she never used. I really want to get her a friend, I just need to know if it would be alright to put the new bird in the old small cage for about two weeks. My guess would be it's about 12x14x15

Also, what could I do for toys? She has 3 toys but only plays with 1, and how many toys would I need for two birds? Would it also be okay if they shared the same food/water containers or should I get them each a different one, because the cage only has the doors for one food/water container.