Unfortunately while the booster offers some protection, it will not guarantee a dog does not develop Kennel Cough. Given her history of being in a kennels so recently, it is something we need to consider strongly.
While Kennel Cough normally causes a loud 'honking' cough with no other symptoms, some dogs can develop secondary bacterial infections which can lead to signs including lethargy, laboured breathing and a fever (which can lead to shivering).
Other considerations would include lungworm, a foreign body in the throat (such as a grass awn or blade), a fungal infection etc.
If she is happy to eat and can go on her walks, her gums remain pink and her breathing settles when she sleeps, it should be okay to have her seen in the morning.
However, if she is struggling to breathe or her signs are worsening, a vet visit is best tonight.
If the vet is concerned, they may run some tests such as a chest x-ray.
Her treatment will depend on what is found and may include e.g. antibiotics and an antipyretic (a medicine to bring the fever down).
At home, ensure the air is well ventilated and free of dust, smoke and cooking fumes.
Offer a teaspoon of honey 2-3 times a day.
Use a body harness rather than neck collar when walking and keep walks to a minimum; just for toileting.