Right.
You guys are limiting the Dragonborn by the games. If it's the GAME Dragonborn, then yes, Pearl will win. The Dragonborn from the lore, however, is not to be underestimated. The Thu'um alone, the Dragonborn's most powerful asset, is far more diverse than the games show. First of all, let us take Miraak - the First Dragonborn. By the time you get to him in the games, it's an epic fight but ultimately you should usually just smack him into the dirt. But lorewise, not quite. Vahlok the Jailor and Miraak had a battle that ended up with the entire island of Solstheim being shouted right off the coast and turned into, well, an island. Miraak also "supposedly" had the power of Herma-Mora (can't spell Hermaushakakd) but that didn't stop the Dragonborn from forcing him into the dirt.
The Greybeards - cranky old men that can shout those damn kids off their law. Remember, the Greybeards' voice was powerful enough to cause an earthquake throughout all of Skyrim and possibly beyond. And they aren't even the Dragonborn. They trained to do that for their entire life. The Dragonborn had the potential to learn it much more quickly. And you guys, maybe Slow Time isn't entirely reliable (you forget, it doesn't slow down time - it speeds up reactions) but there's still a gajillion other Shouts the Dragonborn can fall back on. Take for example, Bend Will. Pearl might not fall to it, but if she does, then the Dragonborn is gonna have fun. Then there's Soul Tear, which can pretty much bitchkill most things it hits - except for tough enemies, and Pearl is definitely a tough enemy. But it's still going to leave a metaphysical scar. Mini-tornadoes, ghosts, and dragons can all be summoned with the Thu'um. It's a pretty valuable asset.
Now, if the Lore Dragonborn is a magic user (which is most likely true) then the Dragonborn is also a low-high regenerator (?) thing. Restoration spells can quickly mend wounds and the like, and they aren't hard to cast. Even the basic Restoration spells are immensely valuable. And then there's the usage of the elements of lightning, fire, and ice - summoning daedra, making ones skin as hard as ebony (to those that don't know, it's steel's badass grandma) and even making ones enemy go crazy, piss their pants, or making them all chill. So don't underestimate the dragonborn from the lore.
But do underestimate the game version. Because the game version is garbage that I spit on.
But this is all from me being a fan of Skyrim, so I'm going to look up Pearl and learn how she fights and all that and maybe change my opinion.