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彼女が部屋に入ると

when she enters the room

→ 彼女
phrase Rare #39,627
when she enters the room The particle と indicates that the following event happens when or as soon as she enters the room. In past-tense narratives, it can be translated as “when she entered the room.”
JA: 彼女が部屋に入ると、みんなが静かになった。
EN: When she entered the room, everyone became quiet.

彼女が部屋に入ると彼はベッドで上半身を起こした。

When she entered the room, he sat up in bed.

彼女が部屋に入ると彼は立ち上がった。

When she entered the room, he stood up.