Yes me. I had a lumbar puncture just before New Year and it took a few weeks for the backpain to subside. I felt like I'd been kicked in the back and the pain spread horizontally across the width of my back as well, rather than just being around the injection site.
I also got the lovely post LP headaches, so spent the best part of a month laying flat out recovering.
I was told I could leave after an hour by the registrar that did my LP, but the ward sister told me two and a half hours. I left after the two and a half hours of lying flat and then lay completely flat for 48 hours at home, but it didn't make any difference.
I don't think there's much they can do about it really. If it was really bad headaches they could do a blood patch, but if its back pain they just tell you to take anti-inflammatories and rest.
I would probably take her to get the injection site checked though, just to be on the safe side - in case of infection.
I suffered from severe complex migraine for years, I feel for your dd as its a horrible affliction that really dominates your life. I used to be bedridden for weeks at a time with them. Eventually, about six years ago, I went on the epilepsy drug Topiramate/Topomax for six months and have only had a couple of migraines ever since - and they were nowhere near as bad. The treatment itself is horrible and the side effects were awful, but I'd do it again in a heartbeat, as it literally changed my life.
Hope she feels better soon.