First of all, welcome to the board, Dwayne! Looking forward to your input on all things game shows.
To directly address your question, here's what I would do:
1) Golden-Road has a vast recap section where episodes of TPIR are summarized. Find it
here.
2) Run a search of "Peggy" using the search function in the upper right. (While "Davis" might be more uncommon, the recaps usually only have first names listed, so a "Davis" search might be of no use.)
3) Sift through the episodes that show up, and see if there's a match. You might be able to directly pinpoint the episode based on what pricing game she played, what she won, and things like that.
4) Once you find an episode, go over to the
Price is Right Video Collection and run a search on that episode.
5) If there's a match, click on the YouTube link and watch the video.
If that's your aunt, congrats! If not, I would try contacting the Fremantle archives and see if they can help.