Alpacky is the Alien variant of Camelle and retains the base destroyer ability. She attacks and moves slower, but is more durable, and can survive a lethal strike. When her health reaches 1%, her strength multiplies by 10.
Li'l Nyandamcan also be a non-Uber alternative, albeit very inconsistent, as even though his range is just a little more than Alpacky's, he might not always outrange her: see this video for an explanation.
Save your Cat Cannon for when she survives the lethal strike to easily finish her off before she can cause further chaos However, if you are unlucky, the ability will activate before the lethal strike. If that happens, use units with good speed like Crazed Cow or Maglev Cat to get a hit off. Do not let her hit the base under any circumstances as she can likely knock it out in a single hit.