The special edition of Aliens suggested she eventually got married (to someone called McClaren) and passed away before her mother was rescued. But factoring in the duplicitous nature of Weyland-Yutani ...

The picture of Amanda that Ripley receives in 1986's Aliens when she wakes up after 57 years in hypersleep. Fun Fact: This picture is actually of Sigourney Weaver's mother. Hence the resemblance.