The only information I've been able to gather on Diane Adams comes from pro-life web sites. Human Life International mentions that abortionist Angel Acevado Montalvo was charged with manslaughter in two cases of maternal deaths from safe and legal abortion. HLI also notes that after his conviction, Montalvo went right back to business doing abortions.
Priests for Life posts a list of women who have died from legal abortions, including Diane Adams, whose date of death they give as February 28, 1992. They cite a March 5, 1992 article in the Virgin Islands Daily News. They cite one other death, that of Rosael Rodriguez, from that article.
Rosael Rodriguez and Diane Adams are most likely the two women referred to by HLI.