With the twitching, I would make sure she is keeping her blood sugar up. I get that way when my BS drop. Pregnancy can really throw your BS for a loop. She needs to be ingesting a lot of protein, because carbs will cause her BS to rapidly rise and drop, protein keeps it steady. If she is eating cereal for breakfast, suggest she try a high protein breakfast instead...yogurt (unsweetened and then sweeten to taste with honey), cottage cheese with some fruit on top, eggs, etc. This really helps me stabilize myself.
The metallic taste is probably a mineral deficiency. Is she on vitamins? Are they a readily absorbable kind? Sometimes prescription prenatals are not well absorbed and switching to something else, like those found in a whole foods/herb shop is absorbed better. Eating lots of leafy greens, red meats, etc. will also increase her mineral levels.
It can be so hard to eat right early in pregnancy. Encourage her where she's at! 
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~Bekah
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