Hi..
Can understand your concern..
As per your complain it seems that she has an
Allergic reaction to the drug which she has injected leading to inflammation at the site of injection which is causing pain,swelling as well as itching at the injection site as well as itching all over the body is a clear sign of
Drug allergy..
You should immediately consult a physician and get evaluated..
In case of allergic reaction antihistamines like allegra or
benadryl can be relieving..
In severe symptoms injectable antihistamines and steroids should be taken for faster relief..
For pain she can take anti inflammatory painkillers like
Ibuprofen..
At the site of injection ice packs can provide relief from itching ,redness..
Steroid based
ointments can be applied..
Avoid intake of the drug that has caused allergic reaction to avoid reaction in future..
Hope this information helps..
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Thanks and regards..
Dr.Honey Nandwani Arora.