hi there my name is helen needing some advice.... i have got 2 young female guinepigs.. called missy n molly.. there are sisters... but molly got a tumour and died 3 weeks ago... missy is lost with out her... she spends all day crying... and its breaking my heart... i have only ether had 1 guineapig before.... how long will she grieve for...do i get her another one or what do i do... i dont know what to do... how long do thery grieve for help please advice!!:0{:|