I am not an expert or parent but I do have sensory processing disorder (although I also have autism and ADHD and it's hard to differentiate between them all). The first thing I would like to tell you is that it CAN and likely will get better as she gets older and you can better explain to her what is happening and communicate more clearly to navigate her specific struggles.
At this age, it's probably going to continue to be rough. Yes, I do think it is a good idea to "minimize clutter" and promote a sensory-friendly environment. That said, she will also need some exposure to things that are probably going to be uncomfortable to her! There are typically warning signs that someone is approaching a meltdown, so I recommend doing your best to identify them and help her regulate since she's still too young to self-regulate effectively.
Unfortunately I don't have a ton of practical advice because there's not really a one-size-fits-all solution here. Be understanding and patient. My parents very much were not and it exacerbated my struggles into adulthood. Know that she will appreciate your effort and will appreciate experiencing new things that might be uncomfortable at first, if you work with her instead of trying to force things onto her.