How often should i be grooming?

[quass]

I finally brought my new MC home a week ago Friday after waiting what seemed like forever (I first saw her when she was 4 wks). I have owned cats before but she is the first long haired cat I have owned. My only experience is my mums cat who was a long haired rescue who hated being groomed and was at the vets getting shaved every couple of months.

I have been grooming her everyday as she had a few matts that I had to cut out when I first got her and I wanted her to get used to being groomed.

Her fur is now looking really greasy and I am not sure if it is due to me grooming her too often.

I just wanted to know how often people are grooming their cats as I feel I may be paranoid due to my mum's cat.

Thanks