Yes it is. The other 3 bottles might increase a bit when you drop the one bottle. Offering water at every solids meal and any snack times is advised.
You could also consider introducing a small snack in place of the bottle, so the times and routine stays the same but instead of milk she is offered a small piece of fruit or a small pancake or cracker, with a drink of water, and then you can keep lunch the same a little later. Switching the mid morning and mid afternoon milk feeds to snacks worked well for us, I just found it easy to know when to have those snacks.
Mine never really took more than a few sips of water but there's also quite a lot of water in fruits and some other solid foods.