If you have cash on hand to fund the rehab and want to extract it soon after the project is done, you can use delayed financing.

The platform's main focus is processing mortgage documents in their raw form to extract specific financing terms for all properties in the city.

If your mom continues to hold the 1st lien on the property, you would need a 2nd position equity loan product for investment properties to stack behind this to extract your rehab funds.

However if I do a BRRRR I can achieve infinite return by extracting all of my investment.

Quote from @V.G Jason:  Extract the long-term value(appreciation) by hanging tight for 8 yrs ++,  mitigate cash flow by keeping more money in the deal and/or altering rental formation. 

However, my under writing due to the recent rate hikes shows large cash negative after a high LTV refi to extract the equity so I am not currently actively pursuing BRRRRS and I find this is true for many of the local investors that were doing brrrrs a few years ago.  

However, in this market i find it difficult/impossible to not have negative cash flow after extracting the value add at maximum LTV.  

Wild how many fees PM's tack on to extract value from tenants ontop of rent.

However if I do a BRRRR I can achieve infinite return by extracting all of my investment.

Extract as much as you can from Bigger Pockets/their podcast, that's great.