I think what they said is a spur of moment. You know we got emotional when we aren't faced/served with logical/rational reason.
It's not that we hope the mom would be gone fr, it's just we expect there would be a moment of mom & the child to be honest to one another. Which in ch24 we really got it. People have complicated mind and emotion, and sometimes they overthink before anything. Remember what we feel can become what we think and what we think become what we do. ╮( ̄▽ ̄)╭
If FL's Mom don't know that 'apparently' FL need a break, they never communicate. Well, everything would go under the bridge with complication of misunderstanding and hard feelings

I really HATE the mom, im sorry but I kinda want her to die, or at least for the fl to explode into rage and argue with her about how her mom is suffocating her and making her suffer, just like explode and letting it all out.