Should I confront My Aunt for this?

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I'm in the midst of booking for my tour to Brisbane and Goldcoast in late July. Last weekend, here in my country, there is a travel fair than normally a lot of travel enthusiast will visit. The entrance fee to the fair is $3. As I knew the organiser, I will always manage to enter for free. I went to the fair together with my sister, aunt and a friend. While there, I asked my aunt if she gonna buy airticket for her son who wanted to go to Melbourne. She shrugged her head and said that let him book for himself. While going thru booth after booth, we reached an insurance booth where they are promoting travel insurance, obviously. My aunt stopped and urge me to ask the exhibitors for the price. All this while she never said anything. When I was busy at the Australian booth, she made a phone call. After which, she told me that she need to buy the travel insurance. When I asked her, she said it for her daughter. We went back to the Insurance booth and get more information. While discussing with the insurance agent, I discovered that my Aunt will be going together with her daughter family and his son too. When I asked further, if they had book the flight ticket, she mentioned that her daughter had bought the ticket from her daughter friend. I told her why not buy from my friend the one that we bought ticket from. She reply, never mind, my daughter friend can give us good price too. At that moment, I felt pity for my aunt as I knew her daughter and her son will take advantage of her on the price of the air ticket as she had to fork out the fare for them as well. Today, when I called my friend who work in the travel agent to book my flight, my this friend said that my aunt came 3 weeks ago to buy air ticket to melbourne from her. My heart sank. I felt that my aunt cheated me. Why must she lied to me? Why must she said that her daughter bought the ticket from her friend which is actually my friend whom I introduced to her when we bought our ticket to Melbourne, Adelaide and Sydney last year? Why must she said all that knowing that if she asked me to do booking for her, I will always help her?. It not that I mind they do the booking themselve but why must she told me lies. My friend will surely give me some discount if I'm the one do the booking for her. I didn't want anything from my Aunt, just to help her cause she are not sure of many things and I don't want her to get cheated by anyone. Mind you, I even offered to purchase for her travel insurance online cause it is much cheaper. Imagine how devastated I felt when I knew the truth. I wanted to call her immediately and bombard her, but I'm too sad and angry at the moment. I'm scared that I say the wrong things when full of emotions. I spoke to my colleague about this and she said not to confront her, but my conscience said otherwise. Do you think I should confront her or just ignore the situation? Should I offer her my help the next time? I felt that I'm being stupid to always help her and she taking advantage of me. I'm frustated, help me make decision.