Can you provide a source for this? I haven't heard Warren call for an arms embargo, but maybe I'm not in tune. From what I understand very few senators support the arms embargo, despite wide support.
“I think it is clear that Congress has a responsibility to act. We have legal tools here. And as I said, we cannot approve the sale of arms to a country that is in violation of our own laws on this."
One could argue that Gaza aid was tied into the bill as well. However, Israel has been known to be blocking aid into the region, even before this vote took place. If Warren truly cared about the refugees/people of Gaza, she would have supported Sanders' second amendment to the bill to restore funding to the UNRWA, which provides most of the food, water and shelter to Palestinians. But she didn't.
I couldn't find any other mention of her supporting an arms embargo after this vote either (unless I'm missing it, which is entirely possible given how difficult it is to find this shit). I remain unconvinced of Warren's resolve on this matter.