It all depends on amounts transacted before.Has she ever deposited cheques in her account of such an amount?If not the bank will be curious to know source of funds.
Part of prudential guidelines from CBK on Anti Money Laundering.
Just give her a fowarding note saying..."Dear mum....please receive this 100k as part of my support towards completion of our house
...
Your sweet and loving son Enyands.
She can show that to the branch manager.
Love is beautiful and so are those who share it.With Love, Marriage is an amazing event in ones life time, the foundation of joy, happiness and success.