It depends entirely on what the offence(s) were and when they were committed. This is then compared to the same offence, should it have been committed in Canada.
When you and your partner are permanent residents you can 'apply to sponsor a family member'. When this approval is given for you to be sponsors, you then apply to sponsor your mother. The timescales in this are probably prohibitive - around 5-year wait for you and your partner if going down skilled...
There is a rumour going round that the minimum number of points required for a SW visa from the UK is set to rise soon from 67 to 70/75 to reduce the number of people eligible for immigration. This in response to massive increase in numbers applying compared to quota of visas available yearly. Anyon...
