What any of you people would do is effectively irrelevant because you're not her.
She has not presented enough information to anyone in order for you to make an educated assessment for what SHE should do.
I would never, under any circumstances, buy constant lighting. I'd buy a lens. However, I shoot buildings and occasionally shoot people outside on location and deal with either no lighting or a flash. That's what I do, so constant lighting isn't something I use much.
Does that mean it's what SHE should do? No. My experience has zero relevance to her situation unless she happens to shoot what I shoot or something with the same requirements. Until she has stated what she shoots, every other "I would do XXXX!" post in this thread is useless at best, and misleading at worst.
How is getting feedback from people that used to be a similar situation in any way irrelevant? If the OP had said, "I shoot astrophotography, should I get a new lens or a flash" it would be a different story. But, since she feels the 50mm 1.4 can benefit her over the 1.8, we can assume she is not primarily interested in Macro, architecture, or astrophotography. We also know that she feels an Alien bee can benefit her. So, we can further gather that she shoots general things, people, food, items that peak her interest, etc. Kind of a general shooter, which most photogs are.
I can also look back on my own experiences and realize where the breakthroughs were and which equipment purchases just sit on the shelf. Just because you are incapable of offering advice doesn't mean that everybody else's feedback is useless or misleading. Don't apply your shortcomings to other people.