Hopefully you already learned that, but nevertheless someone else might need it. Pronto/pronta is an adjective, not a verb. Only verbs conjugate for person (and number). Adjectives (and pronouns/determiners) decline for gender and number (reflecting nouns). Adverbs, conjunctions, interjections and prepositions do not inflect.
- sono, sei, è, siamo, siete, sono (person+number conjugation)
- pronto, pronta, pronti, pronte (gender+number declination)
- quasi (no inflection)
Not clear from the discussion below why the man says Sono quasi pronta. They might want to wonder if they should make the recordings gender appropriate. We have also heard the man say "I am Maria." Interesting that the people doing the recordings didn't seem to notice the oddness of this.....