If you want to transfer money to your colleague's mother, you can choose to transfer money or Alipay, and attach some words of comfort and encouragement, such as "Please use this money to buy some fresh fruits to make your body recover faster" or "I hope this money can help you and wish you a speedy recovery".
Besides transferring money, you can also buy other things, such as bouquets, nutriments, tonics and so on. Or go directly to the hospital to visit my colleague's mother. Such a move can express your concern and sympathy more directly.
Generally speaking, your actions should be based on your concern and respect for your colleagues' mothers and your relationship with your colleagues. When making a decision, we should consider all the factors and make the most suitable decision.