Hey all! Saw a few mentions here, been busy with a friend visiting here in LA actually! Since you know the area, I’ll say that I’m working on Venice and leave that to you 
I skimmed over the thread and read a good deal but please do let me know if it seems I’ve missed something.
Co-op and expenses
As far co-op pay goes, there are a few factors in play. If you don’t go to LA, you have to pay housing. You’ll likely want to go out occasionally and eat food regardless of where you co-op. Taxes, especially in California, will take a chunk. Getting a co-op in LA is no walk in the park your first co-op especially when you won’t have prior co-op experience to bolster your resume, which expands your options. There are about 40 NEU co-op’s in LA this semester for the whole school, about a quarter or less CS. That’s partially due to who wants to go where, but it’s still going to be much harder than Boston, or even SF/Valley area, where there are at least 40 SF co-ops in CS alone.
The bottom line for CS co-op is that I would assume you take home 10K plus any housing savings. Let’s assume you did 1 co-op in LA to be super safe. So, maybe 40K savings over all years. You can end up with more, but I would not consider it for making this big of a decision. I think 10K a co-op is a safe bet for CS.
Major change, other factors
@MotherOfDragons has an important point, and you have a fair reasoning for it, but it’s still a risk factor. If you leave CS before co-op, you’re taking on 100K for who knows what major.
As others have mentioned, make sure that borrowing that much is even possible before even putting it as an option on the table. Get familiar with parent plus loans vs federal loans and look up the exact payment schedules.
Re 5 vs 4 years and salary differences, at the very least it will even out as a wash over time. I absolutely would not rush out of school for another year of full-time salary.
Re @blountwil2 : Very good points on the when of the total cost. For the OP, this shouldn’t make a huge difference if the loans are structured to start on graduation but is something to keep in mind for yearly financials.
The reality is that you have a lot of great options in CA that will be much cheaper likely and not have all of these risks. I would agree with @ClassicRockerDad that it shouldn’t be completely off the table yet, but I would be assuming that you will have a much better offer elsewhere. I do think that fit can be worth a certain amount of money, and I know I don’t need to tell you about CS here.
Here’s what I would do. Forget about NEU for the next few months and focus on all your other schools. Wait for all the offers, crunch all the numbers, and before you decide, go back to NEU with a number to appeal with “give me X more $ and I will be able to safely commit”. Worse case, they say no. However, I say forget about NEU because I suspect you are going to have better options, and if you look as closely at them as you have at Northeastern, I think you will find great options with MUCH less debt where you can find at least comparable programs. I know for a fact other colleges have tech related living options and nearly all programs I know have female CS/STEM clubs and networks you can dive straight into.