The sequence of the events

Dear Teachers,

Thank you for your kindness in advance.

[Question]
When did the event in the underlined sentence happen?

1) When Kay Rene's mother heard a new mother in the same hospital,
where she had given birth, question if her baby was her own.
2) When Kay Rene's mother approached Kay Rene after her father's death
and acknowledged that she had heard a mother question if her baby was her own.

The families learned rumors of babies being switched at birth had been around for decades.
In fact, Kay Rene first learned of such gossip in 1995 when her sister Carol told her
during their dying father’s last camping trip.
After his death, Kay Rene’s mother approached her about the subject.
She acknowledged that she heard another new mother in the same hospital, where she had given birth,
question if her baby was her own. But after looking into Kay Rene’s big brown eyes,
she determined this was her baby and she wouldn’t bring the issue up anymore.