That said, she'll still show her homework with 〜つつも

Grammar Explanation: Contradicting with 〜つつも

As summer break is half over, talk of summer homework comes up. Yukari says she won’t let Mina copy off of hers.

ミナ:: 「まぁそんなこと言(い)いつつ最後(さいご)には見(み)せてくれるよね」; “Well, even though she says that, she'll show it to me in the end, you know.”; Literal: “Well, while saying things like that, in the end she'll show it to us, right?”
サナエ:: 「学級委員長(がっきゅういいん)だしね」; “She is the class representative, after all.”

Key Points

1言(い)いつつ = “while saying that / even though she says that”

Here つつ marks a concessive idea: Mina means “even though Yukari says that now…”
The omitted も is understood from context, so the sense is still basically 〜つつも.

2そんなこと refers to Yukari’s refusal

そんなこと points back to Yukari saying she will not let Mina copy her homework.
Mina is dismissing that statement as something Yukari says now, not as the final outcome.

3最後(さいご)には signals the eventual result

4見(み)せてくれる adds the nuance of doing her a favor

くれる shows the action as something done for Mina’s benefit.
So 見(み)せてくれる is not just “show it” but “show it to me” with the giver oriented toward the speaker.

5よね seeks agreement

The ending よね sounds like Mina is asserting her view while also expecting Sanae to agree.

最後 (Last)

最後(さいご) means the last, the end, or the final stage. It marks what comes after everything else.

委員長 (Committee chair)

委員長(いいんちょう) means the chairperson or head of a committee. It is the leading member entrusted with directing the group.