Question about 48v phantom power (European voltage if it matters)

My daughter lives in Germany, she is just gettig into audio recording though she has a decade of experience in creating DnB music. So she bought an M-Audio keyboard/interface combo but it does not have phantom power. Not realizing she might need it, she bought a Shure condenser mic while visiting here (USA) that requires 48v power. She bought an XLR cable with the mic and we went yesterday to get some strings and a tuner for her and she picked up a 3' XLR cable.
She is going to wait to buy a 48v PS in Germany because of the difference in voltage, I think it is all 240 over there and 120 here.
 
Will the microphone> longer XLR cable> 48v PS> 3'XLR> interface> to computer by USB work? ... and is 48v phantom power all created equal or should she pay more for a better one. We looked at the ART Tube MP V# yesterday but they also have one without the presets etc for half the price. Any thoughts on what she should get or not get to avoid making a mistake? She uses a Macbook. She was using Reason4 and Garageband but just downloaded Reaper. She will be micing vocals mostly. She has an acoustic/electric and a Gibson LP so she can go direct with guitars but she may want to mic them some too, I don't know.
 
Any suggestions or thoughts are appreciated!!
 
Julien (and Becky)

I looked at the replacement power supply. It is a 9V AC power supply, and it is rated 230V (not 100 - 240 V). 230V / 50 Hz is the standard in Europe.
http://www.thomann.de/de/art_netzteil_fuer_tube_mp_serie.htm
If you want to use a DC supply, it may work. However, you may need more than 9V, probably 12V. If you want to avoid the hassle, buy the preamp in Germany.
By the way: Many people (even in Germany) are not aware of the fact that anything you buy comes with a 2-year warranty. If the device fails because of an manfacturing defect , you can return it to the shop. The shop has to repair it or replace it at no cost. If (only if) they cannot repair or replace it, they have to give you the money back. You will need the original receipt.

Wilko