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Showcase '95 #1 (story A) - January 1995
1). When she saves a trio of scientists from a high tech mining disaster, Supergirl learns of crystals that have a molecule structure similar to her own protomatter form
Supergirl #2 - March 1994
1). While exploring Singapore, Supergirl learns that Lex has been marketing her likeness without her permission, though he spins it in such a way to convince her that he's doing her a favor
(1/5) Action Comics #692 (October 1993)
Supergirl uses her shape shifting powers to disguise herself as Clark, so that Superman can "rescue Clark" from beneath rubble from Doomsday's rampage
Non-Superman update:
Bloodwynd was really Martian Manhunter the WHOLE TIME! *gasp*