Bridesmaid dress alterations

Hi everyone


I'm hoping someone can give me some advice!!
I've just visited a seamstress to look at two bridesmaids dresses. Both dresses are the same design and style and need roughly the same alterations - taking in at the sides, shoulders adjusting, hem and one of the dresses needs to be let out as it's come in a bit small.
As she was talking to me she mentioned £200 and I thought she meant for both dresses but it wasn't until the end of the appointment it became clear it's actually £200 per dress! By this point she'd already taken some boning and cups out the dress.
I'm running out of time to get the adjustments done but £400 seems far more expensive than what I was expecting and quite a bit out of the budget. I left the dresses there as I wasn't sure what to do but have messaged her to put any work being done on hold so to speak for now to give me some time to process.
There is some chiffon on the dresses so I do appreciate this will lift the price somewhat, I just didn't expect to pay almost as much to alter the bridesmaid dresses as I did my wedding dress.
I'm panicking and hope someone may have advice on if I'm being ripped off and need to go collect my dresses and try somewhere else or if this seems reasonable? It just seems very excessive but being new to all this I'm happy to be told Im wrong!
Thank you!!!!