Fundraising is not about colour, but in reality, certain models and optics appeal to certain donors and donor groups (individuals, trusts and foundations, HNW, corporates, government) and sometimes those donors are mutually incompatible because it's expensive to cater to all donor sectors. For example, a charity that is very used to being funded by H's personal connections has probably not done a huge amount of monitoring and evaluation because it costs money and they haven't needed to- no-one says "Sure I'll give you $100k to play polo with Harry but first let me check your latest impact report". Conversely that's the first thing a trust or foundation will ask for, and they might be actively put off by the idea of polo type fundraisers , because it suggests that the donors aren't monitoring the impact (impact focused donors like to see other impact focused donors already committed basically).
I'm speculating, but I wonder if she saw that, and decided to bin off the polo in order to improve attractiveness to foundation or "UN" type funders who might give them big, multi year grants which would improve their income predictability, and then either it didn't work or it wasn't given time to work.