The award-winning Christian singer and songwriter took to social media to explain why she forwent being by her mum's side.
Writing on Instagram, she said: "Very early this past Sunday morning, my dad called to tell me my mom had a heart attack.
"Living far from my family has never been easy, but it's never been harder than it was in that moment."
Grant, who fell herself in 2017 and had an operation to remove cancer from her throat, said she felt "paralysed" hearing the news.
"How serious is it? Is she OK? Should I fly home? I gathered my girls and Bernie and we prayed. And then we decided to go to church [because ]I sure couldn't think of a better place to be in that moment," Grant explained.
"One thing was certain, I had zero control over my mom's situation, but being with my church family and worshiping the one who's in complete control brought such comfort and hope."
Grant flew from Nashville, Tennessee to be with her mum in Seattle, Washington after church.
She has asked for people to keep her mum in their prayers.
"Mom is doing well," the post states.
"The doctors have identified some problems which they say are reversible, hallelujah!"
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