my educated guess is she needs a higher dose. yes, reflux can get worse from 4-6 months, or anytime, really
…
is she spitting up a lot a lot? that’s what cereal is for. it also helps with weight gain. for fussiness/pain then meds is what helps. from my welcome/intro there’s info about all of this
– I don’t have it handy, but to find the link, just go look in ‘Introductions’ at anyone’s post
– I post my welcome/intro for all newcomers- you might want to bookmark it for future reference

I’m sorry your daughter isn’t doing so well…