I actually think it to be within Doom's character to do something like that... having the foresight to plant a tool and resource within Valeria herself in order to use against Reed. whether it is now, or 10 years later, or 15 years when she is a teen. Doom has been known to leave secret bases and stashes across the globe (africa, antarctica, the middle east) should he need to replenish his tools, as well as plant spies and resources for him to access. That's why Doom is amazing at preparing... he thinks ahead. when looking back at that scene when Doom helped deliver Valeria, that look in his eye as he considered Johnny's plea. Did it seem to you he is taking it as face value to trump Reed, or a golden opportunity to plant something within Sue, Johnny and Valeria to use against Reed in the future?