How does new morde ult interact with yuumi?

Like, if he ults the adc yuumi is attached to, does she go in too? or is she left by herself (making her an easy target if another teammate doesnt pick her up), or is she still in the normal rift world but still following the adc akwardly giving off their position...

Either yuumi is op with morde or morde counters yuumi, or both....