The cuddle is the right thing to do when she is at her most upset due to sensory problems. Many of us like deep pressure hugs (which is basically a cuddle). I find them deeply relaxing and reassuring myself.

A blanket that she could coccoon herself in helps temporarily simulate that deep pressure hug. It isn't as good as a hug, but it comes close enough.

Can you change your driving style to switch to slow stops? It requires more distance between you and the car in front of you. Basically you brake just enough to slow down, but come to a complete stop as rarely as possible. Freeways are easier on me than lights (as long as it isn't Stop N' Go traffic). Stop signs aren't bad as long as there is no other traffic. As a passenger, being driven is even bigger hell than being the driver myself. When I am the driver I can make the car flow to my personal rythym. Sudden stops really take a big toll on me, especially as a passenger.

There are no SPD medications and most of us negatively overreact to medications. It is probably be best to just stick to the medications for your daughter's genetic condition and be extra careful about how she reacts to them.

I have a lot of special food diet requirements, but they are due to my genetic condition (Hypokalemic Periodic Paralysis) and my food allergies. Some Neuromuscular disorders and SPD makes a person more vulnerable to GI troubles. In the long run, it is probably best to have a Nutritionist double check your daughter's nutritional health every few years.