Is combining the adoption of the sayings of different jurisprudential schools considered blameworthy talfiq (unwarranted eclecticism), and what is the criterion for that?

It is permissible for a layperson to emulate a scholar whose knowledge and piety they trust. They are not obligated to adhere to a specific madhhab (school of thought). It is also permissible to combine rulings from different madhhabs (talfiq) provided certain Shari'ah-compliant conditions are met.

Based on this, the questioner may follow the Maliki school regarding the issue of recurring ritual impurity (al-hadath al-mustankah) without being bound by their rulings in other matters, such as the "transfer of impurity," "ablution (wudu')," or "continual emission of gas (sals al-reeh)." This does not constitute forbidden talfiq.

However, if the Maliki school is not followed concerning recurring ritual impurity, and its emission is not regular, then the ruling for continual emission (sals) applies. It is advisable to follow the prevailing madhhab in her country to avoid confusion and difficulty.