Mine was tight too... Radiation is exact they do not want you to move at all. Others here are right she will likely lose weight and it will become more loose. she should let them know when this happens they may have to make adjustments.

best of luck!

Cheryl : Irritation - 2004 BX: 6/2008 : Inflam. BX: 12/10, DX: 12/10 : SCC - LS tongue well dif. T2N1M0. 2/11 hemigloss + recon. : PND - 40 nodes - 39 clear. 3/11 - 5/11 IMRT 33 + cis x2, PEG 3/28/11 - 5/19/11 3 head, 2 chest scans - clear(fingers crossed) HPV-, No smoke, drink, or drugs, Vegan