Is AUTHOR wrong in the post ? POST : (TL;DR at bottom)

Weeks before my birthday, a friend asked who my favorite actor/actress was. I had a gut feeling she was going to do something amazing with whatever name I gave her; having them wishing me Happy Birthday on Twitter, for example. I had no idea that the gift from her Mom would be an autographed picture of a favorite actress!!! To say I was shocked and emotional was a huge understatement. I cried. They cried. I was elated and speechless over this priceless, thoughtful, and unsuspecting gift.   
 

I'd learned that my friend's mom knows someone who has a connection to big names in Hollywood. Mom kept saying, "She signed this JUST for you!"; "It's real, and she stopped to take the time to sign it just for your Birthday"; "I didn't want her to write your name on it in case you decided to sell it later". This got my spidey senses tingling. Why say this repeatedly? I stared at the photo to admire it, it became quickly obvious that the signature was not real marker ink on paper but a machine pressed stamp of the autograph. Am I a trained professional in autographs? No. But I am smart and I have excellent eyes when it comes to spotting discrepancies. Later on, I took the photo out of the frame to have a closer look and had my suspicions confirmed. The signature was way too symmetrical and evenly inked to have been a marker. I could see/feel the perfect indentation left by the stamp. No need to have it authenticated.  
 

I've thought about it and have decided it’s unfair to be angry that it's fake. Instead, I tell those that ask about it that I have a *genuine replica* from the source. But what do I tell Mom? Do I even tell her at all? I want to give her the benefit of the doubt, surely she wouldn’t be lying to me, right? She either had no idea that it’s not real and truly thought she gave me an original; or, she knew it was fake and was trying to pull one over on me. I want to believe the former; I want to believe in her innocence and thoughtfulness.  
 

If I was her and thought *I* gave someone an original autograph and they found out it wasn't real, I'd want to know so that I could either make it right, or, avoid making the same mistake to someone else.

**WIBTA** for politely mentioning that I've come to learn that the signature is not real? I don’t want to lie to her and say I took it to be authenticated when I did not. I don't have the desire to "catch her in a lie", I just want her to be aware of it, so she doesn't do it to someone else; or have her naivety be taken advantage of in the future.   
 

**TL;DR:** Was gifted an autographed picture of a favorite actress. Discovered it’s a machine stamped signature; not signed specifically for me as the Gifter repeatedly stated. The gifter either did or did not know that it's fake. I don't know how to tell her, or if I should tell her.  
 

Thank you for your input.