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"She won't be with him forever," Janis is quoted as saying by Grazia.
"Before he got arrested and incarcerated they were beginning to have rows."
Janis added she won't criticise her son-in-law for fear of upsetting her daughter.
"It's better to say nothing than something bad. If I push her away, she'll go to him harder."
Winehouse dedicated her recent Brit Awards performance to her jailed husband. The singer reportedly fell over while rehearsing for the awards show.
Winehouse's father, taxi driver Mitch, claimed that Fielder-Civil threatened Amy with divorce during a heated argument.
