Nested if-else statements with pandas dataframe

I load multiple pandas dataframes in a dictionary each representing a different timeframe of data. I then loop through each dataframe adding columns with calculated values(from other columns). The last column i have written out the logic in psuedo code but it will get quite complex with all the nested if statements so I was looking for some help as to structure the code and logic.

Here is a sample of the for loop to starting adding columns to the dataframes based on calculations of df fields.

for key in df.hist:
    df.hist[key] = df.hist[key].assign(Target=(df.hist[key]['Spike'] == True))
    df.hist[key] = df.hist[key].assign(StopLow=np.where(df.hist[key]['Target']==True, df.hist[key]['low'],None))
    df.hist[key] = df.hist[key].assign(targetLow=np.where(df.hist[key]['Target']==True, df.hist[key]['low'],None))
    df.hist[key] = df.hist[key].assign(MomentumVal=np.where(df.hist[key]['Target']==True,'Initiated',None))

..... ..... Now here is the pseudo logic that I would like to basically update the column 'MomentumVal' that i've created above. Anything with a [1] or [2] means one or two rows previously. Any help as what the most efficient way to do this would be appreciated.

if MomentumVal[1] == 'Initiated':
    if shortLR > shortLR[1] and shortLR >0:
        if midLR > midLR[1] and midLR >0:
            MomentumVal = 'midtMoMo'
        else:
            MomentumVal = 'shrtMoMo'
    elseif midLR > midLR[1] and midLR >0:    
        if lngLR > lngLR[1] and lngLR >0:
            MomentumVal = 'lngtMoMo'
        else:
            MomentumVal = 'midtMoMo'
    elseif low < targetLow:
        MomentumVal = 'Exit'
    else:
        Momentum = Initiated

elsif MomentumVal[1] == shrtMoMo:
    if midLR > midLR[1] and midLR >0:    
        if lngLR > lngLR[1] and lngLR >0:
            MomentumVal = 'lngtMoMo'
        else:
            MomentumVal = 'midtMoMo'
    elsif shortLR[2]> shortLR[1] and shortLR[1] > shortLR:
        MomentumVal = 'Exit'
    else:
        MomentumVal = shrtMomo

elseif MomentumVal[1] == midMoMo:
    if lngLR > lngLR[1] and lngLR >0:
        MomentumVal = 'lngtMoMo'
    elsif midLR[1] > midLR and close < close[1]:
        MomentumVal = 'Exit'
    else:
        MomentumVal = 'midMomo'

elseif MomentumVal[1] == 'lngMoMo':
    if lngLR[1] > lngLR:
       MomentumVal = 'Exit'
    else:
        MomentumVal = 'lngMomo'
else:
    MomentumField = None