Palps doesnt strike me as a guy that would create snoke without having control or some contingency plan over him, especially if Rey was so important too him. Even if he wasnt a vessel of palps, he had to have officers in the first order (General pride) reporting on snoke which means he would know that snoke was after rey. Youd think he would definitely know that snoke had his precious granddaughter in the throne room and was ordering kylo to kill her. I cannot see palps taking such a huge risk like that; if snoke was completely autonomous, palps of all people would assume that snoke would turn on him cause thats what sith do lol (esp with snoke knowing palps probably cannot stop him in his current condition). Palps also lived by the rule of 2, its hard to imagine he would even allow 3 at any point in time, let alone create the third himself again without having some sort of control over the situation.
Also i cant get past this line in 2019 comic book Star Wars: Age of Resistance ? Supreme Leader Snoke implied a direct connection between Snoke and Palpatine. In the book, Snoke speaks of Luke Skywalker to Kylo Ren, stating, "If I had your uncle by my side instead of you, the galaxy would have been mine a long time ago". Snoke is speaking as if he is palpatine here.
Unfortunately the films do not answer this question explicitly outside of showing that palps created snoke, it makes no sense that palps would allow snoke (his own creation) such autonomy. The one consistent element though is that both snoke and palps ordered ren to kill rey. We have to infer that palps wanted ren to kill rey, he was going to use ren as a host all along (why he waited so long and did not do it when ren first showed up in exegol wanting to kill palps is beyond me) but leia ****ed up that plan, by turning ben back so when Rey showed up in Exegol she became palps contingency plan by default since she was the only option left. If we are to assume palps wanted rey the whole time then his actions do not make any sense because ben was going to succeed in killing her ass the second time but his mother intervened. We know palps did not expect leia to do that cause he even says the princess/mother ****ed with his plan