ばかりなの

just; only

→ ばかり
phrase Uncommon #15,694
just; only After a past-tense verb, 〜たばかり means “just did.” With nouns or other phrases, ばかり can mean “only.” The sentence-ending なの adds an explanatory or emphatic tone; ばっかり is a more casual form of ばかり.
JA: 私は始めたばかりなの。
EN: I just started.

ここには今着いたばかりなの

Did you just get here?

イギリスから戻ったばかりなの

I just got back from the UK.

昨日初めてしたばかりなの

I only did it for the first time yesterday.

が出たばかりなの

The book has just been published.

— 落下の解剖学 (2023)

今の女性に貸したばかりなの

I just lent it to that woman.

— 花様年華 (2000)

彼女は離婚したばかりなの

She just got divorced.

— 甘い生活 (1960)