JPEG files don't have XMP files, even in Lightroom. When you have that option checked, the changes are written to the header of the JPEG file. If you don't have an XMP file somewhere that includes all of the changes then I don't know of any way to restore the changes.
I don't know of any utility program or LR plug-in that would allow you to recover an .xmp file from an export.
Making regular (every time you close Lightroom, or at most once a week if you don't process a large amount of photos) and automated backups of your catalog file is mandatory.
I thought I might not get a xmp from a jpg but was hoping of some way to recover the edits that I have done.
Software to recover deleted .xmp's, .lrcat,...anything.
I have tried Data Rescue but it didnt recover the files I was looking for.
oh and I have tried Preset Ripper. A LR Plugin that copies some jpg settings to selected photos inside LR. Great little app but still not helping me with my photos
The key is to have relevant backups of the catalog. The catalog is the file that Lightroom opens and modifies. Even if you write changes to XMP the changes are still recorded in the catalog. So if you have a good current catalog backup you always have that to turn to.
I normally do backups all the time and save them in multiple locations but was upgrading my optical drive to an internal drive all while traveling for 6 months so things just got a bit out of hand.
So you learn...:)
Sad, but true.