[Too Many Items mod not working on Voltz LAN world]

Forgive my forum noobness, i LITERALLY have no idea what i'm doing

[Too Many Items mod not working on Voltz LAN world]

OMG you people amuse me XD My sister was just being a retard in the end, she turned off the item list display thingy and only had to press O

[Too Many Items mod not working on Voltz LAN world]

My sister and I created a Voltz LAN world but she is having some trouble with the Too Many Items mod. I am the host and am having no difficulty with the mod, it is only when she joins the world that it isn't working for her alone. Any suggestions as to what's going on?