Umbridge's fire?

[Meg]

No: HPFGUIDX 67782

--- In HPforGrownups at yahoogroups.com, "revaunchanistx" 
<coyandbecky at y...> wrote:

> 
> 2. The using of Thestrals. The group had possibly two other options 
> (both mentioned by others)Use the Floo Network, or fly on brooms. 

Speaking of the possibility of these guys using the Floo Network... 
If Umbridge found out that HRH were using her fire when they were 
talking to Sirius, why didn't she have it monitered by the MOM? Was 
she hiding something that she was doing, that she could have been 
using the fire to do??