How do I find my Favorites in Photos app on iPad?

Find your Favorites

1. Open Photos.
2. Scroll down until you see Pinned Collections.
3. Tap Favorites.

See Find your Favorites, Recently Deleted, and other albums in Photos on your iPhone or iPad - Apple Support

If you are using the People & Pets collections, then you could go to your wife's People album

and go to the Sort menu at the bottom, select Filter, and then filter by Favorites.

The People album probably doesn't have all the pictures of your wife, so you could select all the pictures in People, and add all those to an album you've made for her. Then use search to find other pictures of your wife, add those, and then use the Filter in the same way.

Once you filter the pictures so that just Favorites show, you can select those and make a separate album, if you like.

What do you think-- is this what you need?