If it was your partner's money, then it was all her choice. Relationships should be open and honest though. If the money was yours, then talk to your partner to see their motive for sending the money to others. If it has good intent, and the money was your partner's then there should be no problems.
She should inform you and as a couple , share things , if she hasn't told you , must be something , she/he doesn't want you to know, supporting a charitable cause , in a relationship , Should be done togather in my opinion