MDD, No one is talking about tznius per se. If dealing with normal office activities and conversation violates your sense tznius, then, by all means, remove yourself from that environment. Granted, I don’t know the specific nature of the interplay and conversation in Ms. Mentch’s office. There very well may have been inappropriate advances made, but my sense is that she felt threatened by what most would consider innocuous office pleasantries.
In the “goyishe veldt” there are very strict laws and work rules against harrassment. Don’t believe me? I worked in an office where a fellow was written up and officially admonished for telling a female co-worker, My, you look nice this morning.” So, yes, I stand by my statement that “…millions of women (and thousands of frum women) work in offices everyday with dignity and safety.”
The ideal for all Bitei Yisroel is ” eshtecha k’gefen piryah b’yarkesei beisechah”, but the sad fact is that many Bitei Yisroel have to join the work force to suplement family income or, R”L, as primary bread winners. To effectively navigate the working world women have to learn to differentiate between real threats to halachic propriety and immaginary ones.