It is clear that delaying mikvah after the 7 days is highly unadvisable even in many extenuating circumstances. However there is no mention of delaying a hefsek taharah thus consequentially delaying mikveh in a case where a couple knows in advance that it will be difficult do go to mikveh 7 days later (long walk on shabbat, 3-day yom tov, etc.). That way, they are not delaying mikveh which is wrong but are indirectly delaying it via a loophole in which it is not mentioned anywhere that one must acheive a hefsek as soon as it is possible.
Thank you for your question.
The reasons against delaying mikveh also apply to deliberately delaying a hefsek taharah. She is not going to the mikveh at earliest opportunity.
Additionally, sometimes seemingly extenuating circumstances change - a Shabbat away is canceled, a mikveh lady agrees to stay later, etc. If a woman delays her hefsek taharah, she forfeits the opportunity to take advantage of a change in circumstances.
This internet service does not preclude, override or replace the psak of any rabbinical authority. It is the responsibility of the questioner to inform us of any previous consultation or ruling. As even slight variation in circumstances may have Halachic consequences, views expressed concerning one case may not be applied to other, seemingly similar cases.
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