The way the whole situation was handled may definitely have a negative effect with regards to securing future funding. Hopefully not.
However, if there are concerns over how things were being handled internally, and these concerns were not taken into consideration, it is in the interest of those who were previously involved with the charity to ring the alarm and change direction and maybe found or join new charity that champion a similar cause and serves a similar demographic.
At the end of the day, a charity if not a fortune
100 company, you can secure all the funds that you want, but there will always be the need to make sure that the largest proportion possible goes to the intended receivers.
A good way to secure additional funding would have been to highlight the efficiency of the whole operation with figures.
If she feels that she is being attacked unjustly, why didn't she come out with figures and argue that actually no, PH, the board and are wrong because "x percentage of the funds are going to the children".