Yeah, I'm going to have to come down on Faye's side on this one. This co-signing with Dora, is this something that Bubbles would disapprove of? Then she can voice her disapproval right there and bring it to a halt. Is it something she would approve of? Then whence the problem? In otherwords, she had the opportunity, right there on the couch, as an equal, to approve or disapprove. She did not take it.
If she wanted more advance warning: Faye's phrasing in the third panel is bad, but she's not wrong. She can't run every single thing by Bubbles (Nor can Bubbles run every single thing by Faye; they're on equal grounds here) and some things are time-sensitive and cannot wait for a meeting and debate. Did Faye have any reason to believe that Bubbles would not approve of this? I don't even mean a LIKELY reason; did Faye have any reason AT ALL to believe that Bubbles would be against the idea? I haven't seen any reason for her to expect that. If she (or Bubbles) believes that the other will very likely approve of an idea, then it's reasonable to go ahead with it - in fact it might get tedious to have to "rubberstamp" what the other knows full well they'll approve.
And, well, what exactly HAS Bubbles done in this enterprise? I'm not sure who contacted that landlord but it seems likely it was Faye. Bubbles did inventory and logistics calculations, which are certainly valuable, but not leadership-type things. It was Faye that made the call to the city for permits, Faye who said she poke around for a fab shop, Faye who's done all the negotiating...even with Dora, whom Bubbles had suggested they consult with. I went back a ways and didn't find ANYTHING other than "ask a friend?" that Bubbles has done of her own initiative. What is she doing RIGHT NOW to move this forward? Is she thinking of ideas? Helping look for fab shops? Securing other financial considerations? Looking for clients? Designing trademarks and advertising? Drawing up a business plan? No, she's sitting quietly, reading a book about succulent care. If she wants to be involved equally in making decisions...she needs to actually make decisions, or do things proactively to move forward with this. It isn't fair to leave all of the leadership to Faye then throw a tantrum when she does leader things or that herself is only involved in approving or disapproving the decisions Faye makes. If Faye has to sit on her ass, too, to make it "equal", then this thing will never get off the ground.
Now leader stuff is a skill, mostly for outgoing people, and Bubbles is not. I really don't think that that will be her strong suit, and that's ok, because Faye makes up for that weakness while Bubbles makes up for Faye's weaknesses. But, again, it's not reasonable to expect to be involved in a role that she can't or doesn't proactively go into.