Maricha desperately pursued her, but a baby yukkuri's footsie can't keep up with a human's legs.
"Mwommiee! Mwommieeee!!""Sorry little one! Goodbye easy!"
"Waich!! Mwommie'sh leaving Maricha bwehind! Nyanojee!?""Sorry little one, Reimu is going to go back home!"
"Yu... mwommie, whach are you saying noje...? Let'ch chake id eajy wich Maricha even more?""It's time to go home"
Therefore when "mister human" suddenly held up "mommy", Maricha doesn't understand what's happening at all.