Elizabeth Wagmeister Senior CorrespondentJamie Spears says that Britney Spears’ personal conservator, Jodi Montgomery, told him that his daughter is “mentally sick” and wanted to place her under a 5150 psychiatric hold.Now, in a statement obtained by Variety, Montgomery is pushing back on Mr. Spears claims — and, once again, asking him to step down from his daughter’s conservatorship.“Ms.