んじゃないかしら

I wonder if...

→ の
phrase Rare #41,099
I wonder if... A soft, tentative way to express a guess or opinion. It is a conversational contraction of のではないかしら and is traditionally associated with feminine speech, though usage varies.
JA: 明日は雨が降るんじゃないかしら。
EN: I wonder if it will rain tomorrow.

あの車あなたには少し小さすぎるんじゃないかしら

Don't you think that car might be a little too small for you?

離婚するんじゃないかしら

I wonder if they're going to get divorced.

今度のことに関係してるんじゃないかしら

I wonder if it has something to do with what happened this time.

— マルホランド・ドライブ (2001)

手袋をした方がいいんじゃないかしら

I think you should wear gloves.