Our son is currently undergoing shot therapy for allergies. The shots are not a big deal, but it does require that you have the child at the doctor every week for the injections. EVERY WEEK.
Now, if your daughter really is comfortable with that doctor, and that doctor is who is going to be giving the injections, then you might wait to begin therapy--BUT, you COULD go ahead and get the testing done to find out what her triggers are. You might be able to eliminate some of them or avoid some of them some of the time. Maybe not. But maybe so. Also, ask how they do the injections. For my son (who's 12), he doesn't actually even SEE the doctor when he gets his injections, unless it is time for an evaluation or something. The nurse gives the injections. The doctor must be present at the office, in the event of a bad reaction, but he doesn't actually "treat" my son. The nurse gives the shots, my son plays video games for a half hour, the nurse checks his arms for reaction, notates his chart and we leave. BUT, every 6 weeks or so, or whenever he finishes using a vial of serum and a new one must be formulated, he DOES see the Dr. And that is probably something to consider. The same doctor would probably need/want to be making the call on the formulations throughout the treatment plan.
Does that help?