I had asked for some further information and have not heard back.
There are several considerations in this situation.
Since the Strep test was negative, the primary infection and sore throat would be related to a viral infection.For the sore throat, it can help to use throat lozenges to sooth or throat sprays to numb the throat.
The ear pain is a bit more complicated. The most common cause of ear pain associated with a viral infection is an infection of the middle ear, an otitis media. However, an otitis media typically would not cause redness that is visible to someone looking at the ear. The eardrum is usually red, but it usually requires a specific tool to be able to see the eardrum. If she is unable to pop her ears or there is pain or discomfort with popping her ear, that would support that the ear pain is from an otitis media. For ear pain from an otitis media, ibuprofen is usually sufficient, but when the ear pain is not relieved, then alternating between doses of ibuprofen and acetaminophen may do better. It also may help to perform Eustachian tube exercises, such as chewing gum or forced swallowing.
The other common cause of ear pain would be an infection of the ear canal, called otitis externa. This type of infection is typically not associated with a viral infection, but it would commonly cause visible redness of the ear. If the redness also involves the ear canal or there is visible swelling in the ear canal, that would support that this may be an otitis externa. For an otitis externa, prescription antibiotics is usually necessary, by ear drops or pills, but there are some home ear drops that can be used that may be helpful. You can mix 2 parts rubbing alcohol with 1 part white vinegar and place a few drops into the ear several times per day.
If I can provide any additional information, please let me know.