Is she going down ok for her nap at 10.30am? If she is, and she doesn't seem too OT before it, then I'd say leave it as it is.
Perhaps aim for an early BT of 6.30pm. When my DS is OT an early BT really helps and often leads to a later wake up time too. This isn't always the case though, with some LO's it never works, but is worth a try.