I think that if your horse is going fine in a french link stick with that, particularly if she's got a low pallet.
That bit you posted, while lovely and gentle looking, leaves all the pressure of the bit on the bars of the horse, and because it's so far from her tongue it may actually hit her pallet. I find horses prefer bits that rest on their tongue more than anywhere else, the bars and pallet are both firm with no squish to them, while the tongue is squishy and can absorb some of the pressure. French links and KK type bits are my favorite for that reason. They don't hit the pallet, the pressure is applied to the bars, but the tongue has the ability to absorb some of the pressure or pick the bit up off their bars.
Most horses in single linked snaffles will lean hard into the bit so all the pressure is on their tongue or bars to avoid the joint hitting their pallet, so clearly that's where horses prefer the pressure.
IMO, if it ain't broke, don't fix it.
ETA: if you really feel she needs more room for her tongue, you could look into something with a less extreme curve, like a myler: