I know others with mor knowledge than I will chime in with the explanation of 'seal pointe'. I know it is some sort of markings at least on their ears, which is darker then the body coat. But, let's let a real meezer chime in...

As to the age...you can tell by the teeth if she is younger or older...a younger kitty will first have baby teeth..very sharp and pointy (ouch), but I think by 7-8 months adult teeth might be in already. If they are, they will still be (usually) whiter and cleaner than a 3 year olds....

Then, finally, I think it is a good idea to keep a cat that has had surgery away from all other animals for at least 24 hours. They are still recovering, and don't need the stress of other cats. They will jump, and not appreciate their limitations at first- so, the smaller the area, and less temptation, the better.

I have forgotten why you aren't keeping these two kitties together...and why do you think Angel will mess? I can't remember if she had this problem with her other owner???

Good luck!