Any investment made under any person’s name has to be linked to a bank account in his or her name. The source of funds also has to be from that very bank account. This is required as per law to establish traceability. That is the essence of anti money laundering law that aims to control activities of anti social elements and terrorists.
The solution is to open a joint account with her and you as the second holder. You can use an online platform for doing this.
Mutual Funds is an easy way to invest in the share market without the stress of having to pick individual stocks (and selling that at specific times). It is easy to do the process above using an online platform (such as Jama.co.in with which i am associated). You can open the account in her name, and then contact support (help@jama.co.in) to get the joint account process completed within minutes.