I had lidocaine infusion but not ketamine. I did not get any benefit from the lidocaine. After my pain was high but it could of been just a flare. I did not have the side effects stated. the nurse was there the whole time asking me though if I felt swelling or not ok.
I do agree from all the doctors I saw that starting with least invasive to more if it does not work is the way to go. I had in the start docs who wanted to do big procedures without trying less and I am glad I did not because some lesser ones sent me backwards as what was supposed to settle the pain increased mine.
I hope you can find what works for your daughter