I'm currently re-reading Deathly Hallows and came across a discrepancy. Checking the Harry Potter Wiki, it turns out there is no discrepancy, but a deleted scene from Deathly Hallows is wrong because of this.

Thought this might be interesting to know before reinserting the scene. It might be worth muting her saying the spell, making it looks like she does it non-verbally.

http://harrypotter.wikia.com/wiki/Memory_Charm said:
In Chapter 9 of Deathly Hallows, just prior to erasing Antonin Dolohov and Thorfinn Rowle's memories, Hermione says that she has never performed a Memory Charm before, despite having already altered her parents' memories.[8] However, J. K. Rowling has said this was a different charm[3], which alters memories rather than removes them.

Despite Rowling's statement that the charm Hermione used on her parents was not the same, in the Part 1 film adaption, Hermione uses the actual Memory Charm to eradicate her mother and father's memories of her.
However, it all still fits in as in the film Hermione doesn't say she hasn't used it before.
Either symbolically or by actual magic, when Hermione performed the charm on her parents, all images of her in their family pictures were erased as well.