A combined $97 billion in anticipated net outflows would eat up more than half of the Treasury's remaining resources.
The current troubles are notably different than the global financial crisis more than a decade ago, she said.
Regulators intervened “because of the recognition there can be contagion in situations like this, she said.
Regulators seized the bank today in a stunning downfall for a lender that had quadrupled in size over the past five years.
The government hit the statutory limit for outstanding debt, $31.4 trillion, in January.
Supply-chain problems have become less of a concern, she said.
The House's Republican leaders say they'll insist on spending cuts in return for agreeing to boost the debt limit.
The regulators said they support initiatives from the SEC and other agencies to address possible risks from investment firms.
Entitlement programs may be cut in a bipartisan deal to raise the debt ceiling.
The debt fight has been pushed back until 2023, when Republicans will take over the House.