High chair or not?

Today's issue...whether or not to keep Lolo in her high chair or to let her sit in a grown up chair by herself. Obviously, the pros for the high chair are that (1) she remains strapped in and can't leave the table until we let her out and (2) she is boosted up to table height without being on her knees. On the flip side, the pros of no high chair are (1) increased independence for Lolo, which she clearly enjoys and (2) she can get on the chair by herself and I don't have to help her. The biggest con in this case is that she can easily get out of the chair by herself too. I'm leaning towards strapping her back in.
As another step towards further independence, Lo is trying to give up her afternoon nap. Unfortunately for her, this is one area where I won't give in. I need her afternoon nap time - perhaps more than she does.
ag