You don't say?

In Cadence's defense the cave system seemed to be like a labyrinth. She could have been lost.

Yes, but she's still useless seeing as Twilight got out in what, like five minutes?

Well, perhaps I am slightly biased...

I like how we all forgot about Lyra and the other two that were with her

Under Aria's control.

but after they all fought for that item Cadnece threw at them, that was it for screen time, they didn't even come back to be the best mares, if they came back

Oh right, you mean from a continuity point of view.
I imagine they got out, but they probably wouldn't want to be the bride's mares after their relative trauma, also I think Cadence would have kept the others as her bride's mares seeing as they helped save Equestira. Again.