This is given as a version of 'we are only waiting for Mum to join us'.
But couldn't it also mean 'we are no longer waiting for Mum to join us'?
Freeform Writing Exercise C1
This is an interesting question.
In fact, to avoid confusion you would use 's'attendre à ce que' to convey an expectation rather than just waiting for something to happen.
in other words,
she won't be coming now
Hope that helps!
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Test your French to the CEFR standard