It's not lost trust. If you were completely neglecting her (letting her scream all night) you'd lose her trust and she'd STOP crying.
She's actually crying BECAUSE she trusts you to 'fix' whatever is wrong OR
....
And here's the part to check...
Because something is wrong.
If she cries every time she gets laid flat she probably has an ear infection OR a sinus infection. Next time you have a head cold (a bad one) bend down fast. That rushing pain is the same that babies get being laid down (slowly). It's because their ears are still growing. That sudden stabbing pain "just" from being laid flat. Oy.
And here's more good/bad news. 6mo is TOTALLY NORMAL for "newborn" waking. It's because of the growthspurt that happens (cluster feeding), AND usually because teeth start cutting, or start cutting more frequently (as an adult who has CUT teeth, not just new ones coming in in the socket of old ones... that HURTS. A lot of kids are fine during the day when they're distracted, but at night the pain keeps them awake or wakes them up). The 'bad' part of this? It happens again at 9mo/10mo mark.
TRICKS:
1) Feed when hungry. I know it sucks sometimes, but babies CAN'T sleep on empty stomachs unless they've had their spirit broken. Very very very few infants can sleep all night and NOT be hungry (those ones have a very slow metabolism). They exist. They're rare. Most wake to eat, because they're growing at night and need to.
2) Tylenol. It's a trick, because if suddenly you have a sleeping or happy baby again 20 minutes later... you know it's a pain issue and you need to sort it.