Not that she had believed Trask’s ludicrous claim.

she thinks Trask's claim is ludicrous.
NR: Hah, hah, no one will believe you are SM.
PR: Well, at least Jimmy, Hank, Max and Thomas won;t be in on the secret as well.
Clark: Well, OK I guess it might be good that not everyone knows.

still, why does Lois have to find it ludicrous that I am SM.
Superman was invulnerable. Superman couldn’t be shot, let alone be bitten by mosquitoes.
Of course, who besides Superman would itch at their mosquito bites so much when they grew up on a farm.
Lois: More proof that Chuck lied. He obviously did not grow up on a farm.
Clark: Then how do I know so much about Smallville politicis?
Lois:

Something is missing. I will tell you when I figure out.
He wouldn’t gag and throw up at the taste of sugar or chocolate. The idea was preposterous.
Clark: This is the real reason why SM can't go on a date with Lois. If he did and she

him just after eating chocolate and he gagged, than that would just be bad.