Chewy, there's a gap in the advice so far...tax planning.
I agree the overall picture is good, but with such a large portion of the nest egg in tax-deferred accounts, tax planning is an important component.
This part you probably know. It's very likely the pension lump sum rolled over into an IRA or annuity will incur no current taxes, but if taken as cash there will be a very big tax bite. That $1M nest egg could be over $100k smaller next April. Maybe more if 10% early withdrawal penalty applies. (Unless there is some sort of exception for over-50 separations.)
There's usually at most a 60-day window for a tax-free rollover decision, so check this out immediately.
Once that part of the equation is understood, the next tax issue is to evaluate is the gross and net withdrawal requirements from your sister's IRAs and 401k's until age 59-1/2.
The base plan needs a cash flow of $48k, $20k to be earned at a job and $28k to be withdrawn from the nest egg. If the lump sum pension payment is tax-protected via rollover to an IRA, the current after-tax nest egg of $130k isn't going to take your sister very far by itself. Especially if a portion is set aside as an emergency fund.
Assuming withdrawals from the tax-deferred accounts will be taxed at a 15% rate and incur the 10% early withdrawal penalty, there is a gross withdrawal requirement of $37k to produce $28k of spendable cash, including a $3700 penalty.
On the other hand, if withdrawals from the tax-deferred accounts are taken as a "72T" stream of payments, the gross withdrawal requirement is reduced by $3700 per year. Search the forum for "72T" and you will find much more on the subject.
Looks to me like the annuity plus social security would put your sister in a very strong for cash flow position for age 62 and beyond, but is almost 100% dependent on the job and IRA / 401k withdrawals until then. If the "planner" did not include age 52-59 cash flow and tax issues in his discussions of that course of action, it is further evidence that he is biased by his commissions.