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Sneak up from behind and surprise her by tickling her sides. Tickle under her arms and around her tummy when you are sitting together on the couch. Use your lips to tickle her neck or ear. Stop if she starts yelling, is having trouble breathing, or if she asks you multiple times.
Gently poking or wiggling your fingers (move them like you are typing really fast) up and down her sides will probably make her giggle, especially if you catch her off-guard. Do this for no more than 10 seconds. When you stop tickling her, you can pull her against you for a sweet hug and kiss. This works well if you have just been kissing, since the physical contact won't come out of nowhere. It may also lead to more kissing! Make sure you aren't tickling her too hard. Tickling can be pleasurable, but only when you use a light touch. Too much pressure and it can become painful. Gently brushing the slope of her neck with your lips or breathing into her ear is a very intimate way to tickle her. It may even cause her to squeal! Tickling can be tricky, because she will be laughing when she asks you to stop, and you may think she doesn't really mean it. But the laughter is involuntary, and she might be in pain, getting mad, or feel very uncomfortable and want you to stop. Only tickling her for a few seconds at a time is a good way to avoid an awkward situation. If she really doesn't like it, you will have only tickled her briefly. If she tells you she really didn't like being tickled, then you know not to do it again.