Vegetable oil?

My CRF kitty is a very picky eater. She will only eat Fancy Feast, and then not very much. She only weighs 6 lbs. and is technically skinny. She will eat more of her food if I put a teaspoon of vegetable oil on it. Since she doesn't have a weight problem, is there anything in veggie oil that can hurt her? How about olive oil?

olive is better as it is purer and you know exactly what she is getting... I often added some to Kandie food... also tuna oil may help with appetite( ask your vet)

I add olive oil to my healthy kitties food My vet actually suggested this.