Chariot, pinzu dai sharin.

(How do you read that katakana, btw? Chiitoi? Chiichitoi? or is that a gliding to "cha" that is reduced to just its horizontal line?)

A horizontal line just means drag the vowel sound of the previous katakana.

Chiitoi.

She abbreviated chiitoitsu (七対子, seven pairs), though that hand would be daisharin (a local yaku, not officially recognized) or chin'iisou (flush) tan'yaochuu (all simples) pinfu (no-points hand) ryanpeikou (two sets of identical sequences).