Well, first of all dropping out of timestop with her mother in the other room sounds like a terrible idea.
It's risky, but not terrible. The mom's partially drunk, watching TV, and Ono's room is locked. As long as Ono doesn't start yelling, there's very little chance of being discovered, and even if she does get curious, the locked door prevents her from entering without warning. In fact, the fact that we're not in timestop means Ono herself will need to hold a bit more control over her emotions if she doesn't want to be discovered.
Dragging her into timestop is also not the best idea. And the plan that's going to be knocking on the window is obviously not going to be in timestop, either.
Basically, there's negatives to both approaches. I think the non-timestop approach is somewhat better,
but, I also ask Mami and Homura for their opinions, and will go with their opinion if they both agree.
So, objection insufficiently detailed to be considered valid.
Also, the school work thing kind feels like it came out of nowhere and isn't all that relevant right now.
The schoolwork is based on my evaluation of the situation earlier. I didn't bother repeating the justifications in the post with the plan.
The relevance depends on whether it's part of the core problem, and the approach to the issue depends on whether Ono acknowledges it or not. If we guessed wrong, then the larger part of that is just skipped, so the objection doesn't hold much weight.
The primary concern in her soul gem.
It shouldn't be. The primary concern is the rate at which she is accumulating grief, and the reasons behind that problem. We can clear the soul gem's current grief at any time; it needs to be done, but is a very secondary concern relative to the cause of needing to cleanse it in the first place.
And Megane is probably going to be incredibly upset and freaked out about us suddenly appearing, so maybe we should figure out some way to calm her down. I wouldn't know how to do that, though
Somewhat valid. I pretty much left that unspecified.
Should probably point out that her mother is in the next room, so she shouldn't make too much noise. Panicked objections can be shut down by simply going to Serious Mode: We Need to Talk. Arrogant refusal can be worked around by simply continuing the discussion. Attacks can be dealt with via ribbons.
I'll add in a couple notes for this.