Just watch her closely and be there for her...make sure she gets extra nose rubs etc and try not to alter her routine too much...but make extra time for her.
its odd bertie didnt want to spend time with wilows body and when bandit was pts bif didnt want to now..she sniffed him jjust accepted it and climbed into my arms for a hug.
The thing to be aware of is how they will be so very very down..and very very lonely...do you have another bun or pet that she could be close to or even within sight or smell of?
willow died and left bertie very very ill indeed within 24hrs of her passing..bif was the same the same day her first husbun oscar died and shed been with his body for hours and was still nudging it and squeaking and trying to wake him up.
When bertie felt lonely he could at least spend time against the bars of the pen next to bandit and bif and we even ended up letting them exercise together to help then were even rebonding them a few weeks before bandit had to be pts. luckily for bertie and bif they were never alone as our two cats are soo close to the buns and were there with cuddles and more cuddles and slept next to them when they allowed them to.
by pure chance bertie and bif ended up rebonding themselves after id given up..shared grief and lonliness bought them back togehter.
try putting a snugglesafe heat pad udner a alrge soft toy for her to snuggle with.....wacth food intake and water intake and poos and wees..sit with her talk to her and do NOT sit crying with her..i did this with bif and i made her freak out totally. when you feel the tears start tell her youll be back later and dont go back til youve tried to compose yourself a little bit..she could handle silent tears but not my anguish that went along with it.
dont rush to get her a friend until youre sure shes ok....the new bun wil ahve to be quarantined anyway..soemthing i didnt do withbertie..she was orrible to him once shed elt him wash her and sleep laongsisde ehr in a crate in the kitchen..back int he lounge he was in a paen and she kept attacking him thru the bars etc..
she didnt like him being ack in her room..and was angry at me but he saved her life..shed laid down to die and if he hadnt turned up that evening were sure shed have been gone by morning.
it depends on you and your grief just as much as hers