Not one phone call.
But apparently an incomplete photograph was enough to make her remember where her daughters lived.

Part 6 — “If She Wants Family, She Gets Family”
The following morning, Jennifer came downstairs wearing a dark green dress.
Lizzie followed in a navy one.
I stared at them.
“You’re not seriously going.”
“We are,” Jennifer said.
“Why?”
Lizzie picked up her purse.
“Because I want to hear what she’s been telling these people.”
“This could become very uncomfortable.”
Jennifer’s face softened.
“Grandma, it’s been uncomfortable for twenty years. We just weren’t in the room.”
I hated that she was right.
“Fine. Be careful.”
Jennifer shook her head.
“You’re coming.”
“No.”
“Yes.”
“This has nothing to do with me.”
Lizzie smiled faintly.
“If we’re taking a family photograph, the person who actually raised us should probably be in the building.”