Rini transforms into Wicked Lady in episode 78.
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She never does, although that is very popular in fan fiction.
When she first appears, Rini [Chibiusa in the original Japanese series] isn't a Sailor Scout [Senshi]. However, she later gains the ability to transform and does so as Sailor Mini Moon [Chibi Moon]. Because she is Serena [Usagi] and Darien [Mamoru]'s daughter from the future, she is also a Princess of the Moon, and as such, has her own Silver Crystal that she uses to transform.
Sailor Moon is Usagi Tsukino in disguise. She is a young middle school / High school girl who wishes to live a normal life. When the series starts she's 14 years old and gains her magical brooch to transform from a talking cat named Luna, who is later revealed to know her in a past life. With her brooch she can transform into Sailor Moon.
If you're referring to Terri Hawkes, who voiced Serena/Sailor Moon for all of the English-dubbed Sailor Moon movies in addition to episodes 12, 14-20, 22-82, she left the Sailor Moon cast and was replaced by Linda Ballantyne due to her pregnancy.
After Sailor Moon Super S is Sailor Moon Sailor Stars.