Load V3 then go to character folder, her bodysuit should be there in a Daz folder or whatever the folder is named. You need to click on the bodysuit .cr2 file to apply it to V3. It is a good idea to rename this folder V3 Bodysuit so you can find it. Daz lumps all their cloths in the same Daz folder sometimes.

When you apply the clothing look down at the bottom of the library tree of the bodysuit: there's a checkmark, 2 checks, + sign and - sign. Click on the 2 checks, 'Create New Figure" and that will apply the clothing to the figure.