She bores me to death?

whenever we are together by ourselves i'd feel exceedingly bored. i'd jiggle my foot a lot, get up for no reason and walk around, or i'd ask her so hey why haven't i seen your roommates around what are they doing today? she'd say she doesn't know and doesn't care but ask why i want to know. this happened a couple of times. she's obviously too thick to take a hint. should i tell her straight out that she bores me or should i spare her the embarrment?