Orla

a member of the Little Clovers who mentions the name of Ivor and she has curly red hair and with him leaves to join Dez' group Team Shazamrock

she is given a yellow suit when she wishes not to wear plain green all the time.

Even after leaving she calls her past 5 peers "fellow Clovers"

Etymology
A recurring name (which can sound like "Ola" or "Orla") is spoken twice by Dez in the episode:
 * after he says "watch and learn" and before saying "grab the kite" (which he takes from Little Clover with braids) and tossing it to her, it sounds like he addresses her with the name "Ola".
 * YouTube's closed captions do not recognize the 2 syllables he utters between "learn" and "grab" so there are no guidelines on how to transcribe it here.
 * viewers might initially get the impression that the Little Clover with glasses is the one is he speaking to, since she is the one who verbally responds, however the kite is thrown to the girl in front, which makes more sense for pulling purposes. She is also likely the one whose name that Dez would know since she had joined his club and interacted with him more, even though her name is never spoken prior to this moment.
 * YT transcribes a later comment "I wish everything would go back to normal except all on an Ivor" but he was most likely saying "Orla and Ivor".

Órla or Orlagh (pronounced OR-lah) is a female Celtic given name, so this is most likely what was spoken.

The end credits mention Lola Flannery under "Additional Voices" but do not mention her role.

https://www.behindthevoiceactors.com/tv-shows/Wishfart/Orla/ says the role was Orla.