But also, I really think that even if Murderbot provided a lie much less credible than that, she would roll with it anyway.
with her helmet still hanging on a broken tab after SecUnit (coming out from nowhere) yanked her away from a hostile
right after tending to her semi-conscious coworker that said SecUnit retrieved, incurring heavy damage
while her friend bot tends to SecUnit's damage, which SecUnit classifies as "leaking" but probably looks quite gore
friend bot is also damaged after altercation with a person on whom she relied on to protect them all. Damaged and not dead only because SecUnit, expected by a professional security consultant to die in the encounter, won and got back in record time
her arms and skin on the head probably still hurts. In case she needed even more reminders how close to death she got
It's nervous, it's friend-shaped, it's friend-acting, it's incredibly invested in survival of her team, it's her best and only chance to get out alive.
If SecUnit said God sent it personally, Abene would probably start to adress it as a holy messenger without losing a bit. Whatever will calm you down, dear, your actual identity is so much a non-issue right now
(The funniest thing is, if she knew more about SecUnits, she would be seriously considering by now that maybe it was actually sent by God. SecUnits are not supposed to do this kind of shit. SecUnits don't hack proprietary systems smoothly like a hot knife going through butter. SecUnits don't strategize creatively. SecUnits don't fight strategically or skillfully. SecUnits don't change overwhelming weight-class-and-numbers disadvantage into fragile balance. What SecUnits do is follow pre-programmed procedures, secure perimeter and throw themselves on hostiles hoping hostiles run out of working parts first, because that's how SecSystems use them and why give them any more programming over that. This SecUnit is very much non-standard and probability-wise, being sent directly by God wouldn't change much.)
Also, this is a person that raised an innocent trusting bot who never experienced betrayal or hurt from its humans. She actually considers emotional comfort of bots to be important.
Basically, this miraculous nervous SecUnit can have all the fictional supervisors it wants