Sorry but Jamie lee curtis simply isn't funny...
Look I've followed her work even since Halloween and have much respect...but she quite simply is not funny at all.
She actually works better in comedies when she just plays the straight character (My girl 1 & 2)...but trying to make her humourous will never work, and this film is certainly proof. She just can't do it. Frankly I think her best strengths are drama and horror. She can also play the sympathetic character quite well.
But she doesn't have the knack to play comedy...and should avoid at all costs