To go so far as to do something means to do something extreme, but in this sentence, the fru taking the insignificant step of contacting her mom.
Context: She had known the fru wanted her tested, but she hadn't believed they'd take such an insignificant step as to contact her mom.
Hypothesis: She had known the fru wanted her tested, but she hadn't believed they'd go so far as to contact her mom.

Given this context, is the hypothesis true (Yes/No/I don't know)?