Upvote:9
As stated in the comments its the closing balance that they will be looking at to ensure enough funds are there to cover your stay, but you should include all relevant statements.
As she has moved money from her savings into her 'current' account you need to show where that money has come from so it doesn't look like funds parking which can look suspicious and negatively impact your application. By also submitting the savings account information you can show that the transfer came from her own money, and it is available for her to use during your stay, so ensure to submit both for any relevant months.