I can't believe she's 18 months old. That means she's been eating solid foods for a full year. A year of real food! Baby-led weaning, if you're not familiar with it, is simply allowing babies to feed themselves from the get-go with solid foods, once they are able to sit up properly at about 6 months old. (It's also sometimes called infant self-feeding, because of the confusion over the word 'weaning'. In Britain, weaning means to add supplementary foods to a baby's milk diet. In the US it refers to cessation of breastfeeding. We're using the British meaning here.) No purees, no jars, no stages of lumpiness. You provide a variety of healthy options, and they explore them at their own pace.
People who do baby-led weaning are sometimes evangelical about it, as seems to be the case with so many parenting approaches. However, everyone seems to agree that it doesn't matter nutritionally which way you go - so it's just a question of what works for you and your family. My health visitor is really into it, and as it was 'invented' by a UK health visitor, I suspect the NHS is widely supportive of the practice. I would definitely do it again, but it isn't without downsides. I won't go through all the ins and outs of HOW you do it (for one thing, I'm not qualified - read the book!), rather our experience: