What biological mechanism do you believe happens with older women that causes them to stop responding to muscle growth stimulus the same way everyone else does at all stages of their life? We don't see other significant hormone changes resulting in different muscle growth stimulus being required - we just see it have less absolute effect vs. when they are more optimal.
Plenty of older women compete in natural bodybuilding and follow these same training methodologies and get results that put them at competition level. Enhanced, too, but we'll ignore them since the hypothesis seems to be some vague hormone related shift and they're using exogenous hormones.
You shouldn't trust me, but you also shouldn't trust social media influencers or people with a bunch of book deals just because they have a Dr. before their name, but it MD or PhD. What studies is she basing her recommendations on - if they don't exist, how does anyone know that what she is saying is anything more than anecdotes? She has direct financial incentive to promote an idea that stands out from the crowd - it's how she sells books, gets social media engagement, gets media spots, etc. Taking a quick perusal through ROAR, it looks like she provides no references for her claims.
But in regards to the studies, yes, one of the meta-analysis does cover older women in 31 separate studies.
https://www.strongerbyscience.com/strength-training-women/ he breaks down a lot of the details in this blog post.
There is one study included that relates to the 'high load' vs 'low load' training in men vs. women, but it is one study, which is more a signal of 'more research needed' - single study results often fail to replicate. And, as noted in the article / a linked article off of that, there's really no reason anyone, men included, should be training at the rep ranges that are considered low load. 6-15 is the range most people live around for general muscle building, often a bit narrow like the 8-12 I tend to like. People with more strength/powerlifting focus often stay in 3-8.