This is an interesting point. Given what you said about your friend’s expectations of entitlement to your money, it‘s looking like that was the reason she chose you as a god parent. Normally you’d choose someone who IS religious to some extent, so they can fulfill the role of guiding the child’s religious upbringing. Sounds like that was not a consideration at all when your friend asked you to be the god parent for both her kids.
I was child-free for many years and I definitely got the vibe from some people like they looked at me as the custodian of a pile of $$ they would like to have funneled to their kids somehow. People start to think that way and then make opportunistic choices to help broker the outcome they want.
One other comment, in my opinion, if you ever change your mind and re-do your will, make sure the latest one is iron-clad official and done through a lawyer, as I would expect her to challenge its validity - since she has a copy of the current one.