If she is still biting at the incision or trying to pull out the stitches, you may need to use the cone until the stitches come out. Occasional licking at it as in normal grooming most likely isn't a problem at this point. You might ask your vet about using an anti itch ointment on the incision.
Please keep that cone on her, especially since you said she's messing w/ it and biting it. I agree w/ Nancy that the cone should stay on until she sees the vet!
Thanks all for your comments. @nancyjac: I was so afraid to even watch her lick herself because her tongue was rough but I decided to watch to see exactly what she was doing based on your comment(grooming or biting). Turns out she was grooming and cleaned up really well after I cut the long strings shorter, just in case. I keep the cone on when I can't watch her still. Her last day for the cone was today. Thanks so much guys..ooh I love my kitty lol.
Glad to hear it is working out well. Just keep an eye on the incision to make sure it doesn't get red or puffy from her licking. At this point though it has probably healed enough that it shouldn't and it is pretty naturally for her to want to groom that area just like any place else.