No, the recommendation is still 6 months.
There was one study back in January suggesting 4 months might be better, and while it provides incentive for more research into this area, the vast bulk of research suggests that 6 months is ideal. (And wait until 7 months before introducing meats.) Some doctors and healthcare workers have jumped on the 4 month bandwagon because of this one study, and advise early weaning because of it. Treat such advice sceptically.
Our first child sounds like yours - she was feeding every 2 hours, even at night. But we still waited until 6 months to introduce solid food, and we don't regret it. She took to solid food quite easily, though lumpy food took a while longer as she was a late teether.
Our second was a much better milk feeder - feeding roughly every 4 hours and often sleeping 8 hours uninterrupted at night. We gave him solids a week or so before he reached 6 months because it was the Easter weekend, and we had some extra time off work, which seemed like a convenient time.
Introducing solids a bit earlier than 6 months is not going to do her any harm, but if she's not really ready for them, then you'll probably have a harder time of it. If she's anything like our two, at 4 months she'll still have difficulty sitting up straight, which will make spoon feeding her really tricky.
PS: also wait until a year before introducing nuts, honey or strawberries, as these can trigger allergies.