Is it legal to be in a room with a friend while she gets shots?

If your friend wants you to be there and if the medical provider says it is legal and safe for you to be there and wants you there, then you can be there. I can think of reasons why a medical provider might not want a tag-a-long friend, including to protect against the spread of infection, to insure sterility, to prevent possible thefts of medical equipment or supplies, to maintain medical confidentiality, and to provide a better, more open and confidential relationship between the patient and medical care provider. Sometimes a friend goes along to act as an interpreter if a person speaks a different language, or if the patient is frightened. If the medical care provider says you can be there, then you can be there, if the patient wants you there.

You may be present if your friend gives you permission to be there and lets the medical staff know that you have her permission.