no estaba segura de

wasn't sure about

→ no
phrase Rare #48,912
wasn't sure about Used by a female speaker or for a feminine subject; followed by a noun, infinitive, or question clause.
SP: No estaba segura de qué hacer.
EN: She wasn't sure what to do.

Creí que no estaba segura de lo que decía.

I thought she wasn't sure what she was saying.

No estaba segura de qué estaría pensando.

I wasn't sure what he might be thinking.

No estaba segura de adónde me llevaba todo eso, aparte de hacer feliz a Antonio.

I wasn’t sure where all of this was leading, other than making Antonio happy.

Todavía no estaba segura de dónde había iniciado su vuelo la otra nave.

She still wasn’t sure where the other spacecraft had begun its flight.

No estaba segura de poder llegar a tiempo.

I wasn’t sure I could make it on time.

— Barfi! (2012)