Growing in many ways with 成長
Kanji Explanation: Becoming and accomplishing with 成

Mina buys a can of coffee, even though she’s bad at bitter drinks. When her friends question her, she says she’s grown up a bit and should be able to drink it.
- サナエ:
- 「どのへんが大人になったのよ。」
- “What part of you has grown up?”
- ミナ:
- 「私
( だっていろいろ成長( してるの!」- “I've grown in lots of ways!”
Key Points
成長
( is broad growth or development成長
( can refer to emotional, personal, or practical growth, not just getting physically bigger.That broader meaning fits this teasing conversation about acting more grown-up.
いろいろ成長
( してる means I have grown in various ways〜してる is the spoken form of 〜している, giving a present result-state meaning.
Mina is claiming that her development is already visible now.
私
( だって and の add a defensive insistence私
( だって means “even I” or “me too”, pushing back against being underestimated.The sentence-final の adds emphasis, like she is insisting that her claim should be taken seriously.