'Get a crate' is the easiest way to handle it! And in fact I recommend it. Or put her in a different room while you have food for yourself.
If you want a much, much longer method, your best bet is teaching her to be on her bed when you're on the couch and STAYING there for the amount of time it takes you to eat. And then gradually bringing out your food, but only rewarding her with pieces of it when her butt is parked on her bed. Never give her even a lick or sniff of your food when she's jumping and trying to get at you, cuz even once means it succeeded an she'll keep trying.
If you want a much, much longer method, your best bet is teaching her to be on her bed when you're on the couch and STAYING there for the amount of time it takes you to eat. And then gradually bringing out your food, but only rewarding her with pieces of it when her butt is parked on her bed. Never give her even a lick or sniff of your food when she's jumping and trying to get at you, cuz even once means it succeeded an she'll keep trying.