Since she already is infected with hsv1, she is immune or in the very least, highly resistant to new infection anywhere else on her body. While it's not impossible, it is very rare for this to happen. Also, I'm not sure how long you have been infected, but you may be able to attest that for most people, genital hsv1 is no big deal.
As for how big a deal genital HSV-1 is, mine manifested as blisters & then open sores first around the left side of the base of my penis, and then on the left side of the shaft. For the first a week to ten days I'd get brief sharp pains if I moved certain ways, particularly when wearing pants that restricted movement at all in my crotch. I also had some moderate dull pains in my left testicle & lymph node.
But it was all tolerable enough that I declined pain killers from my doctor, when normally I'd accept them, if for no other reason than to have a stash available should I need them for something else.
After that it's just been some pain associated with scabs opening and the wounds therefore being exposed to air. The scabs will open because of course one's penis changes size, and so scabs that form when it's smaller break open when it gets bigger.
So there were some weeks of moderate pain & discomfort, but I've certainly suffered worse afflictions. Honestly, the worst of it has been that we've had to abstain from sex until I'm fully healed.