Actually, her biggest hit was "Queen of Hearts" that reached #2 on Billboard charts lasting 27 weeks, while "Angel of the Morning" only reached #4 and charted for just 22 weeks. The original hit "Angel of the Morning" by Merrilee Rush from 1968 only peaked at #7 and lasted only 16 weeks.
Other top 10 hits include:
"The Sweetest Thing" from 1981
"Love's Been a Little Bit Hard on Me" from 1982
also "Break it to Me Gently" from '82 only hit #11 so ignore that one. Totally she had 11 charted hits on Billboard. I guess that will be enough for one set. This information is from Joel Whitburns book Top Pop Singles.