I don't think that's too much. That's almost exactly how much my 10 lb. cat eats but she is super lazy.
This article gives a good guideline for how to figure out how much food to feed for weight loss...it depends on what your vet thinks the cat's ideal weight should be.http://www.petobesityprevention.com/...nformation.pdf
1 cup of Wellness Core = 536 calories (1/4 cup = 134 calories)
1 cup of Complete Health = 550 calories (1/4 cup = 138 calories)
Wellness Pouches = 67 to 72 calories each (depends on flavor)
Wellness 3oz cans = 99 to 124 calories each (depends on flavor)http://www.petobesityprevention.com/...t_Dry_Food.pdfhttp://www.petobesityprevention.com/...ouch_Foods.pdf
Has she always had this amount of food or have you recently reduced it? It will take a while before her weight starts to drop.