How to invest for elderly parent considering the relatively short runway?

Hi guys, my parent is age 58 now and her insurance savings plan just matured and got a lump sum of 50k, out of which half has went into the CPF to hit FRS in her RA.
I have previously put 25k of her money in NTUC's 1.55% 3 years plan.
I am also currently holding another 20k for her in syfe cash+ and previously , and have a standing instruction to put 200 per month in Equity100 per month, considering that she is going to let me handle her remaining 25k(total 45k now) go under my care and with about 7 years of runway to retirement, how can I make the best out of her money? I technically just want to beat CPF SA 4% while being safe as I do not want to make her feel bad or me be guilty towards losing her money (I know there are no guarantees).

Please don't ask me to get retirement plans, I have already bought some for her.
REITs? IWDA? VOO?
The problem is S&P500 is at the ATH now as well :(