Sentencing guidelines suggest between 4 and 36 months (although life is the maximum). When Huhne and Pryce were convicted, they received 8 months, which was a little longer than expected).
She'll be very lucky to avoid a spell inside, and even luckier to escape calls for her to be recalled.
I suspect that given the call for her resignation from her own party, she'll be hard-pressed to avoid stepping down as an MP.
The problem for Labour is that her majority was 607 and she replaced a Brexit-supporting Tory MP in a Brexit-supporting area which had voted Tory for the last 3 elections. If she attempts to cling on as the MP, then there's every chance that she'll be deselected (she may be arrogant enough to run as an independent, but I doubt it), but if she resigns and the Tories choose their candidate carefully, the Tories might even gain the seat as they held it from 2005.
The problem for the Tories is that the previous MP would be the obvious choice of candidate for a by-election, but has gained a reputation as being a bit of a ****. While telling someone who was rude to him on Facebook that they were a 'thick chav' is mild by Arrse standards, his apparently being rude about a child in Great Ormond Street for having a blanket with the EU flag on it didn't go down that well, even if his explanation that his comment was aimed at the child's father for posting what seemed a politically motivated tweet using his child wasn't completely unreasonable/implausible, it didn't gain much traction.
ETA that Wordsmith got there first with the sentencing guidelines