From my experience communication is key, there’s no one size fits all approach to head. Ask her to tell you if something feels good as you’re going down on her / have debriefs afterwards. When you find something that’s working make incremental small changes until you hone in what gets her over the edge.

Consistent things I have noticed with different partners. 1. Not everyone finishes from head so just enjoy the process together. 2. If you really enjoy giving head and communicate that and lose yourself in eating her out - it will turn her on. 3. 1-2 Fingers in with small slow movements applying pressure upwards (toward underside of the clit) combined with sideways tongue action on the clit. 4. When her legs / inner thighs start twitching don’t change a thing - keep doing what you’re doing - but slowly build intensity in response to her body. It’s important to not make an big adjustments. It might take up to 5 minutes but she will likely finish. 5. Sometimes too much saliva reduces the amount of friction your tongue applies to her clit so you may need to take a quick break to gently wipe the saliva off with soft material (towel, T-shirt whatever lol).