Freewind: no, the game is a bit confused at that point. Ves simply didn't tell Gerald she war raped. The flash back is probably what Gerald has in mind or the truth.
Therefore, he later asked the King and got confirmed about it
She admits the rape by Henselt explicitily.
Geralt asked Henselt about it to see if there was any inkling of remorse there. There wasn't, naturally.
Kitako: Maybe the lie is about the motivations, and more simply she gave herself just to save her skin.
There's no need to guess in regards to this, Geralt says what he means about Ves lying very plainly in his talk with Roche after Ves goes to the Percival
Kitako: I though about it, and had a idea after another playthrough and seeing again the last phase of Chapter 1.
I wondered how I executed a perfect stealth run while breaking on Loredo mansion, and still he was ready to kill me and with a freaking halberd to boot.
Maybe (again) Ves warned Loredo about Geralt coming.
Why would she warn Geralt when he reaches the tower then ?
Nah, Geralt has no way of seeing what' going on in Loredo's tower, those cuscenes of Loredo and Ves are for your benefit, for the player's benefit, not Geralt's, which means it wasn't an act between Ves and Loredo, things were really about to get very nasty for Ves