There's a good chance this is a zWitterion which makes it a pain to isolate, since it's very water soluble.
What if you run the reduction in an aprotic solvent like thf, then rotovap it and dump the crude in methanol with a drop of Sulfuric acid. This will give the methyl ester, which should be very simple to isolate. Then you can hydrolyze it at your leisure.
You can also try precipitating the product from aqueous solution with sodium tetraphenyl borate. Makes a salt with terrible water solubility, but good organic solubility.