It's hard for me to judge her body proportions in the pictures...and, that needs to be evaluated. Her face/neck show no signs of "skinniness".Here's a video
which may help you judge for yourself.
Some points when doing your own exam:
1. Place both hands, palm down, lightly on your cat's ribs. You should be able to feel the ribs, but they shouldn't be sticking out
2. Stand above your cat and check her waist - pets at the proper weight should have a visible indentation behind their ribs.
3. Look at your cat's stomach - a cat that is the correct weight should have good firm muscles and not a wobbly tummy.
4. Examine your cat's face - a cat that is overweight will look fat in the face and may have a double chin.http://www.petsgetslim.co.uk/weight_check/Here's
much more detailed information to help.