Sci Fi book with Wormholes and aliens

It's been a few years since I have read it, and can't seem to recall book title or author.

What I do remember: Main character was female, she was from an upper class society that did life prolonging treatments, she was a space ship pilot (much to the chagrin of her mother) and had to find a suitable "donor" father, after having her daughter, she went on a shake down cruise for a spaceship and got caught in a wormhole. She found a hostile but habitable M-class planet, there was a another sentient species there, along with other humans. The planet had a weird way of making all females have "multiple" pregnancies (twins,trips, etc). Eventually she found contact with her homeworld (space probes launched) and her daughter was put in cold sleep so she could have her mother do her "necklacing" ceremony. Any ideas?

Possibly Nimisha's ship by Anne McCaffrey?

Definitely. Good story, too.