For the first week of a chick's life, 95 degrees is the correct temperature for them, as they have not feathered out yet. It's the same temperature that they would be, under their mother hen's wings, as that is HER body temperature. But the option is there for them to move away from the heat source, and then return. I'm thinking that she doesn't have the heat lamp close enough, and as someone also pointed out, it's directed to the middle, instead of one end of the brooder tub, so that they can move away from the heat and cool off as they themselves decide, so the entire tub is the same temperature, and could be too high. Something is not correct as far as maintaining the correct temperature for them to survive.
As the chicks grow older, and start to feather out, the heat lamp should be raised, to drop the temperature 5 degrees per week, until they reach the 60-65 degree range, which is when they should be moved outside to their new coop. This is standard operating procedure recommended by the experts that do this for a living, and a proven success rate. For you to say otherwise, is giving misleading information.