It may be that you have a larger supply on that side and a faster flow as a result. Generally babies get better at handling it as they get older, so it will most likely resolve itself.
In the mean time positional feeding helps some mums, so feeding upright. Or you can try triggering the letdown first, let it get slower then put her on.
You might find some more ideas here, also - https://www.breastfeeding.asn.au/bfinfo/toomuch.html