I can get traditional financing through a bank but was wondering if I go the "seller financed" route would that be more advantageous?

These should be reflected in the purchase price or negotiated as part of the terms, such as the seller carrying some of the renovation burden.Use seller financing to your advantage by proposing a price closer to $225,000-$250,000 with terms such as 20% down, a low interest rate (4-5%), or interest-only payments for 3-5 years, with a balloon payment once renovations are complete and cash flow stabilizes.If the seller is firm on price, consider negotiating higher down payment terms to reduce the financed amount, paired with interest-only terms or a price reduction tied to renovation milestones.Key questions to address include the condition of the septic system, which can be a significant expense if it fails.

There are also some tax advantages to self-managing. 

If you did, you could take advantage of some unique strategies, like renting it out while traveling (as long as it’s for 14 days or less) and having that rental income be completely non-taxable.

On the other hand, I feel one of the main advantages of passive investments (via syndication/crowdfunding) is that I can hire a manager who has years more experience than I can ever hope to obtain myself.

It's going to offer Strong economic growth, Appreciation (especially in DFW), Tax advantages (no state income tax), and a Growing population, including infrastructure and amenities. 

Gifting her cash simplifies ownership but forfeits these tax advantages and requires filing a gift tax return for amounts over $19,000 (2025 annual gift exclusion).

Cost Advantage: Property prices in Mexico can be 40%-50% lower than comparable investments in the U.S. or Canada.High Occupancy Rates: The average rental occupancy rate in Tulum is 70%-80%, driven by year-round tourism.Economic Stability: Mexico's economy grew 3.1% in 2023, with a robust real estate sector supported by foreign investment.Infrastructure Investments: Developments like the Maya Train and new airports enhance connectivity, boosting property value.Feel free to reach out if you'd like more information on how to invest in Mexico, benefits and insights in general!

For that reason, there is very little advantage (currently) in using crypto, unless you do something like a crypto secured loan as you mention. 

If it was discussed and just a typo and its a good tenant it should be fine but some tenants would definitely take advantage of this.