Hello and thanks for your question.
I'm sorry about your mother's complication. Unfortunately, this significant eye infection is an uncommon but definitely real complication of doing these intraocular injections. It sounds as though your doctor has taken the necessary and standard steps for treatment of this overwhelming eye infection.
How her visual outcome plays out is quite variable. Depending on the eye's response to the medicines given (through injections and drops), it is possible that she may regain some vision in that eye. Unfortunately, however, the likelihood that she regains the level of vision prior to the injection is low.
By way of other/better treatments, I would say that other or changed treatments could and should be given if there continues to be significant inflammation in the eye and the culture results indicate that she needs a different antibiotic. Other than this, however, there really are no other proven treatments for this infection (endophthalmitis) than what she has received.
I'm sorry for your mother's complication. I hope she does well. Did that answer your question?
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My opinion is solely informative and does not constitute a formal medical opinion or recommendation. For a formal medical opinion and/or recommendation you must be examined by your doctor.