It's been said time and time again but there's nothing GASR can do about theft offsite, and IMVU couldn't give a shit about artists. You could definitely try reporting her though.
However, you can report this to IMVU theft blogs and what not.@Saxophonia
is the original artist of a lot of those pieces so if she doesn't see this thread you should message her about it, that way she can message this person, or report/file a DMCA.
*I will be locking this thread later.