Sending one's daughter for Qur'an lessons

Q: I asked one Imaam saheb to start the quran e paak for my 5 year old daughter and he was ready to do it at his residence, but when I told my wife
she said that let her continue at our neighbour's because she is already reading it there. I am very much embarrassed because I already promised molvi saheb that I will send her. I am feeling regret and sinful if I don't send her. Should I explain to hafiz sahab about this or I have to fulfil my promise and send her  any way? Is this a sinful Act. Because a Muslim has to fulfil his Promise in any circumstances. Please advice me on this.