It's a pity you have not given a clue as to size or your location. I suspect the big day has been and gone now but just in case.
Apologies if my suggestions are above budget but might give some ideas and sales are on at the moment. Also she sees a brand she likes it's always searching on ebay. There are some great plus size designers out there but sadly most people are not aware of them.
This website is in Germany but I have ordered several times and it's been brilliant. Fast free shipping and returns
They offer a wide range of plus size clothing and have a section for wedding guests
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Apologies if my suggestions are above budget but might give some ideas and sales are on at the moment. Also she sees a brand she likes it's always searching on ebay. There are some great plus size designers out there but sadly most people are not aware of them.
This website is in Germany but I have ordered several times and it's been brilliant. Fast free shipping and returns
They offer a wide range of plus size clothing and have a section for wedding guests
https://www.navabi.co.uk/clothing-wedding-guest/
Online store
http://www.idaretobe.com/sale/evening-and-occasion-wear-c11
Might be worth taking a look at Brigid Foley in Devon
http://www.brigidfoley.co.uk/home.php?cat=260
In North Yorkshire (very pricey though)
http://www.ahernesuk.com/
If you live near Wales, these shops are not online but have some plus size
http://www.kathygittins.com/index.html