Thanks for the suggestions.

I am not totally sure that Nutro does have a light hairball formula. But I will take Tracy's word for it. I have seen that food before.
Yes Kylie loves the Royal Canin Slim but I just don't think it is doing a suffient job, getting her weight down. And it doesn't help with the hairballs.
She HATES anything drizzled over her food. Tuna juice, oil, doesn't matter, she won't eat it if I try anything like that. And she HATES the hairball rememedy even worse!!! If possible. I have to literally hold her down and pry her mouth open to put it in. It stresses her out and me out. Very much!!!
I feel so mean when I do it.
I have never heard of Pet Gold Light Hairball Control Formula, I don't think we have it around here. The closest we would have to that would be Innova, or Wellness, or Solid Gold and I have no idea where those are carried.