1. some of her donors have finally figured out what a gigantic loser she is... and nobody wants to pour money down a rathole (so to speak)
2. many of her “you pony up $$ for me and I will give you government contracts, favors, and protection” racketeers (including Muslim IslamoNazi dictators on the Arabian peninsula, etc) are beginning to realize that she won’t be able to deliver for them from her prison cell or whereever (so why throw their money away on her?!)
Donors saw Jeb Bush’s campaign run through over $100 million and he seldom got about 10%.
They are seeing signs of the same with Clinton. Add to that the various scandals, etc., and they have to wonder how much MORE they are willing to pour into her campaign.
She is already obligated to foreign entitles who donated through the Clinton Foundation. If those donations were contingent on her winning, she might be in deep s*it having to pay that back, if she loses.