Tracy Hogg even suggested that she helped to eliminate the night feeds at 5 months for a baby, with an example in The secrets of the baby whisperer.
I'd just like to clarify that any night weaning Tracy did with a 5 month old will have included a DF in the routine. Tracy continued the DF until around 7 months (often on the forums we see it dropped around 8 months), being called a "dream feed" it is not classed as a "night feed" as it is usually at a time when mum has not yet gone to bed.
Some LOs are just not ready to drop that NF yet which is why many times we see a DF or NF dropped at more like 8 months.
If you feel ready to try a night wean though I wouldn't see it as a problem. You can gently wean bu reducing the amount you offer in the night by an oz every 2-3 nights. The process can be quicker if you also note how much she takes and not offer more than that the following night (ie she does not drain the bottle so see how much she took, that is how much to offer the next night, and also continue to reduce by 1oz every 2-3 nights).
During the day you need to be ready to increase bottles/solids as needed. She might not increase until a week has passed but you can offer more solids if she wants them to make up for the lost night calories.