According to the wiki the statement of how long her attacks take is a typo, and that is actually the length of the skill duration (in other words, 9 seconds). This agrees with the translation from the English DMM wiki, so is likely correct. As for the actual time her attacks take, while she has not been added to the attack speed table of the Nutaku version wiki, she is on the attack speed table of the DMM version wiki. There she is listed as taking 144 frames to attack (with 60 frames per second) while her skill is active, the same as Deine during skill use. For comparison, the normal attack speed of heavy infantry is 67 frames (or 62 frames after CC). Given the attack speeds for heavies that exist on both tables match, it is unlikely her skill had the attack speed changed as a part of some future balance patch we have yet to receive, so the numbers listed on the DMM version wiki are likely accurate.
More generally put, her skill makes her attacks take a little over 2.3 times their normal time when CC'd or Awakened (given the slightly slower attack speed of non-CC'd heavies, the relative attack speed is slightly less prior to CCing her). This means so long as her skill is at least level 2, her DPS is increased for the skill duration.