Which type did she get ?
Avoid cyanocobalamin, take only methylcobalamin
[The proper form of vitamin B-12 to supplement is called methylcobalamin. This is the form that exists in nature, and it is pre-methylated, meaning it's ready for your biochemistry to put to immediate use. Methylcobalamin has several key advantages over cyanocobalamin:

* Increased absorption
* Better retention in tissues
* Contains no toxic cyanide
* Supports production of SAMe
]
http://www.naturalnews.com/032766_cy...amin_B-12.html