I read that -owa is wife of "insert surname," and -owna is daughter of "insert surname." Are these correct?
Yes it is correct, but as I said before it is somewhat old fashioned. Also, it only works with some surnames, never with the ones ending with -ski/ska or -cki/cka.
You can pretty much always use -owa and -ówna for the surnames ending with -ewicz and other endings.
Examples:
surname / surname+owa / surname+ówna
Karp / Karpowa / Karpówna
Śledź / Śledziowa / Śledziówna
Kowal / Kowalowa / Kowalówna
Gaca / Gacowa / Gacówna
Koach / Koachowa / Koachówna
and so on. Personally I would stick to the original surname.
